diff --git a/Sprint-2/1-key-errors/0.js b/Sprint-2/1-key-errors/0.js
index 653d6f5a0..b89c11267 100644
--- a/Sprint-2/1-key-errors/0.js
+++ b/Sprint-2/1-key-errors/0.js
@@ -1,13 +1,22 @@
 // Predict and explain first...
 //  =============> write your prediction here
+// The instruction wants to define a function with the input (str)
 
 // call the function capitalise with a string input
 // interpret the error message and figure out why an error is occurring
+// the error is in the use of let str. (str) is already an input and you can't use it again.
+
 
-function capitalise(str) {
-  let str = `${str[0].toUpperCase()}${str.slice(1)}`;
-  return str;
-}
 
 // =============> write your explanation here
+//In order to fix the problem we need to declare let with capitalise instead of str. 
+// Because if we use the parameter (str), it creates a naming conflict in the same scope.
+  
+
 // =============> write your new code here
+
+function capitlise(str) {
+  let capitalise =`${str[0].toUpperCase()}${str.slice(1)}`;
+  return capitalise;
+}
+console.log(capitlise("good")); 
\ No newline at end of file
diff --git a/Sprint-2/1-key-errors/1.js b/Sprint-2/1-key-errors/1.js
index f2d56151f..3fcb068e1 100644
--- a/Sprint-2/1-key-errors/1.js
+++ b/Sprint-2/1-key-errors/1.js
@@ -1,10 +1,11 @@
 // Predict and explain first...
-
+//I think it will create a syntax error.Since decimal number is inside the funtion while running the function.
 // Why will an error occur when this program runs?
-// =============> write your prediction here
+// =============> write your prediction here synax error such us decimal number is not defined
 
 // Try playing computer with the example to work out what is going on
 
+
 function convertToPercentage(decimalNumber) {
   const decimalNumber = 0.5;
   const percentage = `${decimalNumber * 100}%`;
@@ -15,6 +16,21 @@ function convertToPercentage(decimalNumber) {
 console.log(decimalNumber);
 
 // =============> write your explanation here
+// we declared a function convertToPercentage assigned with decimalNumber
+//as a parameter then we use const to declare a new variable using the 
+// parameter's name which is wrong.So here again decimalNumber was either a parameter 
+// or declared in wrong way inside the function. We notice that console.log is placed outside the function
+// and in order to return its value, it will show reference error. You may ask why? Well, simply, because
+// there is no such global thing defined outside the function.
 
 // Finally, correct the code to fix the problem
 // =============> write your new code here
+
+function convertToPercentage(decimalNumber) {
+  
+  const percentage = `${decimalNumber*100}%`;
+  
+  return percentage;
+}
+  console.log(convertToPercentage(0.5));
+
diff --git a/Sprint-2/1-key-errors/2.js b/Sprint-2/1-key-errors/2.js
index aad57f7cf..4b5612987 100644
--- a/Sprint-2/1-key-errors/2.js
+++ b/Sprint-2/1-key-errors/2.js
@@ -1,20 +1,29 @@
 
 // Predict and explain first BEFORE you run any code...
+//I think we should define number first before returning it.
 
 // this function should square any number but instead we're going to get an error
 
-// =============> write your prediction of the error here
+// =============> write your prediction of the error here.
+//number undefined.
+
 
 function square(3) {
     return num * num;
 }
 
 // =============> write the error message here
-
+//Unexpected number
 // =============> explain this error message here
-
+// It is not allowed to use numbers in a variable parameter. 
 // Finally, correct the code to fix the problem
 
 // =============> write your new code here
 
 
+function square(number) {
+  const result = number * number;
+  return result; 
+}
+
+console.log(square(3));
diff --git a/Sprint-2/2-mandatory-debug/0.js b/Sprint-2/2-mandatory-debug/0.js
index b27511b41..a77640184 100644
--- a/Sprint-2/2-mandatory-debug/0.js
+++ b/Sprint-2/2-mandatory-debug/0.js
@@ -1,6 +1,7 @@
 // Predict and explain first...
-
+// It will print the result as undefined.
 // =============> write your prediction here
+//undefined because there is no return of the value.
 
 function multiply(a, b) {
   console.log(a * b);
@@ -9,6 +10,13 @@ function multiply(a, b) {
 console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
 
 // =============> write your explanation here
+// when the code run, it will show "the result of multiplying 10 and 32 is undefined because
+// // what console.log does is that it prints the result of a*b but it doesn't return any value"
 
 // Finally, correct the code to fix the problem
 //  =============> write your new code here
+
+function multiply(a, b) {
+  return a * b;
+}
+console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
diff --git a/Sprint-2/2-mandatory-debug/1.js b/Sprint-2/2-mandatory-debug/1.js
index 37cedfbcf..f84deabd0 100644
--- a/Sprint-2/2-mandatory-debug/1.js
+++ b/Sprint-2/2-mandatory-debug/1.js
@@ -1,6 +1,6 @@
 // Predict and explain first...
 //  =============> write your prediction here
-
+// the result would be: the sum of 10 and 32 is undefined.
 function sum(a, b) {
   return;
   a + b;
@@ -9,5 +9,12 @@ function sum(a, b) {
 console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
 
 // =============> write your explanation here
+// the function is defined with the name "sum" there is no return for anything. And if we want to print the result
+// it would be: the sum of 10 and 32 is undefined and what we are actually looking for is 42.
 // Finally, correct the code to fix the problem
 //  =============> write your new code here
+
+function sum(a, b) {
+  return a + b;
+}
+console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
diff --git a/Sprint-2/2-mandatory-debug/2.js b/Sprint-2/2-mandatory-debug/2.js
index 57d3f5dc3..799c21208 100644
--- a/Sprint-2/2-mandatory-debug/2.js
+++ b/Sprint-2/2-mandatory-debug/2.js
@@ -1,12 +1,16 @@
 // Predict and explain first...
-
-// Predict the output of the following code:
+//I think the result would be 3 for 42, 105 and 806 because cost num is declared outside the function
+// in the global scope. And this means any input would take the result of the global scope.
+// Predict the output of the following code:3
 // =============> Write your prediction here
+// the result would be 3 for 42, 105 and 806. Because cost num =103 is defined outside the function.
 
 const num = 103;
 
-function getLastDigit() {
+function getLastDigit()) {
   return num.toString().slice(-1);
+
+
 }
 
 console.log(`The last digit of 42 is ${getLastDigit(42)}`);
@@ -14,11 +18,22 @@ console.log(`The last digit of 105 is ${getLastDigit(105)}`);
 console.log(`The last digit of 806 is ${getLastDigit(806)}`);
 
 // Now run the code and compare the output to your prediction
-// =============> write the output here
-// Explain why the output is the way it is
+// =============> write the output here: the last digit of 42, 105 and 806 is 3
+// Explain why the output is the way it is. Because when we declared the variable const num =103 it is outside the function(global variable)
+// so everytime we call the function, it will use the 103 as a reference.
 // =============> write your explanation here
+// The use of global variable outside the function doesn't accept any arguments. It always refers back to 103 and
+// return the last digit which is 3
 // Finally, correct the code to fix the problem
 // =============> write your new code here
 
+function getTheLastDigit(number){
+  return number.toString().slice(-1);
+
+}
+console.log(`The last digit of 42 is ${getTheLastDigit(42)}`);
+console.log(`The last digit of 105 is ${getTheLastDigit(105)}`);
+console.log(`The last digit of 806 is ${getTheLastDigit(806)}`);
+
 // This program should tell the user the last digit of each number.
 // Explain why getLastDigit is not working properly - correct the problem
diff --git a/Sprint-2/3-mandatory-implement/1-bmi.js b/Sprint-2/3-mandatory-implement/1-bmi.js
index 17b1cbde1..4f6e150a5 100644
--- a/Sprint-2/3-mandatory-implement/1-bmi.js
+++ b/Sprint-2/3-mandatory-implement/1-bmi.js
@@ -15,5 +15,8 @@
 // It should return their Body Mass Index to 1 decimal place
 
 function calculateBMI(weight, height) {
+    const square =weight/ (height*height);
+    return square.toFixed(1);
     // return the BMI of someone based off their weight and height
-}
\ No newline at end of file
+}
+console.log(calculateBMI(55, 1.65)); 
diff --git a/Sprint-2/3-mandatory-implement/2-cases.js b/Sprint-2/3-mandatory-implement/2-cases.js
index 5b0ef77ad..f44340b35 100644
--- a/Sprint-2/3-mandatory-implement/2-cases.js
+++ b/Sprint-2/3-mandatory-implement/2-cases.js
@@ -14,3 +14,12 @@
 // You will need to come up with an appropriate name for the function
 // Use the MDN string documentation to help you find a solution
 // This might help https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/toUpperCase
+
+function ToUpperSnakeCase(input){
+    return input
+    .trim()
+    .toUpperCase()
+    .replace(/\s+/g, '_');
+}
+console.log(ToUpperSnakeCase("lord of the rings"));
+
diff --git a/Sprint-2/3-mandatory-implement/3-to-pounds.js b/Sprint-2/3-mandatory-implement/3-to-pounds.js
index 6265a1a70..126077581 100644
--- a/Sprint-2/3-mandatory-implement/3-to-pounds.js
+++ b/Sprint-2/3-mandatory-implement/3-to-pounds.js
@@ -4,3 +4,21 @@
 // You will need to declare a function called toPounds with an appropriately named parameter.
 
 // You should call this function a number of times to check it works for different inputs
+
+function toPounds(penceString) {
+    
+    const numericString = penceString.substring(0, penceString.length - 1);
+
+    const padded = numericString.padStart(3, "0");
+
+    const pounds = padded.slice(0, -2);
+    const pence = padded.slice(-2);
+
+    return `£${pounds}.${pence}`;
+}
+
+console.log(toPounds("399p")); 
+console.log(toPounds("7p"));   
+console.log(toPounds("50p"));  
+console.log(toPounds("120p"));
+console.log(toPounds("559P"));
\ No newline at end of file
diff --git a/Sprint-2/4-mandatory-interpret/time-format.js b/Sprint-2/4-mandatory-interpret/time-format.js
index 7c98eb0e8..61730ae46 100644
--- a/Sprint-2/4-mandatory-interpret/time-format.js
+++ b/Sprint-2/4-mandatory-interpret/time-format.js
@@ -17,18 +17,18 @@ function formatTimeDisplay(seconds) {
 // Questions
 
 // a) When formatTimeDisplay is called how many times will pad be called?
-// =============> write your answer here
+// =============> write your answer here : 3 times pad will be called. For HH , MM and SS.
 
 // Call formatTimeDisplay with an input of 61, now answer the following:
 
 // b) What is the value assigned to num when pad is called for the first time?
-// =============> write your answer here
+// =============> write your answer here : the first time pad is called is with totalhours and it is 0
 
 // c) What is the return value of pad is called for the first time?
-// =============> write your answer here
+// =============> write your answer here : 00
 
 // d) What is the value assigned to num when pad is called for the last time in this program?  Explain your answer
-// =============> write your answer here
+// =============> write your answer here: it is 1 for the remainigseconds. So we used the 61%60 =1 So remaining seconds is 1.
 
 // e) What is the return value assigned to num when pad is called for the last time in this program?  Explain your answer
-// =============> write your answer here
+// =============> write your answer here : 01.
\ No newline at end of file
diff --git a/Sprint-2/5-stretch-extend/format-time.js b/Sprint-2/5-stretch-extend/format-time.js
index 32a32e66b..14fb094ec 100644
--- a/Sprint-2/5-stretch-extend/format-time.js
+++ b/Sprint-2/5-stretch-extend/format-time.js
@@ -4,10 +4,17 @@
 
 function formatAs12HourClock(time) {
   const hours = Number(time.slice(0, 2));
+  const minutes = time.slice(3, 5);
+  if (hours === 0) {
+    return `12:${minutes} am`;
+  }
+  if (hours === 12) {
+    return `12:${minutes} pm`;
+  }
   if (hours > 12) {
-    return `${hours - 12}:00 pm`;
+    return `${String(hours - 12).padStart(2, "0")}:${minutes} pm`;
   }
-  return `${time} am`;
+  return `${String(hours).padStart(2, "0")}:${minutes} am`;
 }
 
 const currentOutput = formatAs12HourClock("08:00");
@@ -23,3 +30,6 @@ console.assert(
   currentOutput2 === targetOutput2,
   `current output: ${currentOutput2}, target output: ${targetOutput2}`
 );
+console.assert(formatAs12HourClock("13:00") === "01:00 pm");
+console.assert(formatAs12HourClock("00:00") === "12:00 am");
+console.assert(formatAs12HourClock("17:30")=== "05:30 pm");
\ No newline at end of file