diff --git a/src/objects.ts b/src/objects.ts
index ef6298f..381d9c9 100644
--- a/src/objects.ts
+++ b/src/objects.ts
@@ -27,8 +27,8 @@ function createBook(
   genre: string
 ): Book {
   // write your code here...
-
-  return {} as Book; // replace "{} as Book" with what you see is fit
+  let newbook : Book = {title: title, author:author,publishedYear,genre} 
+  return newbook; // replace "{} as Book" with what you see is fit
 }
 
 // DO NOT CHANGE THE LINE OF CODE BELOW (you can use it for testing your code)
@@ -51,7 +51,7 @@ const book = createBook(
 function printBookTitleAndYear(book: Book): string {
   // write your code here...
 
-  return ""; // replace empty string with what you see is fit
+  return book.title + " " + book["publishedYear"]; // replace empty string with what you see is fit
 }
 
 /**
@@ -66,8 +66,10 @@ function printBookTitleAndYear(book: Book): string {
  */
 function addPageCount(book: Book, pageCount: number): Book {
   // write your code here...
-
-  return book;
+// const newbook : Book = {title: book.title, author:book.author,publishedYear:book.publishedYear,genre:book.genre , pageCount: book.pageCount}
+const newbook : Book = book;
+newbook.pageCount = pageCount;
+  return newbook;
 }
 
 /**
@@ -88,7 +90,8 @@ function addPageCount(book: Book, pageCount: number): Book {
  */
 function addISBN(book: Book, ISBN: string): Book {
   // write your code here...
-
+  const newbook : Book = book;
+  newbook.ISBN = ISBN;
   return book;
 }
 
@@ -110,7 +113,8 @@ function addISBN(book: Book, ISBN: string): Book {
  */
 function updatePublishedYear(book: Book, newYear: number): Book {
   // write your code here...
-
+  const newbook : Book = book;
+  newbook.publishedYear = newYear;
   return book;
 }
 
@@ -135,6 +139,9 @@ function updatePublishedYear(book: Book, newYear: number): Book {
  */
 function addSecondAuthor(book: Book, additionalAuthor: string): Book {
   // write your code here...
+  let authors :string[] = [book.author+""]
+  authors.push(additionalAuthor)
+  book.author = authors;
 
   return book;
 }