1.AnhVien took part in her first Olypic at age of 16
= When AnhVien was 16 years old , she  took part in her first Olypic
2 Kathy is 6 years old . Jne is 7 years old. Mark is 9 years old
= Mark is the oldest child 
3 This book is not interesting as that not
= That book is more interesting than that book
not many students go to Ms.Brown I s class ( ATTEND )
= Only a few students  attend Ms.Brown class
5 There s no need to go to school to learn a language now.
= You don't need  to go to school to learn a language now.