求解答英语句子改错I should return the book back to the library at onc

I should return the book back to the library at once
back去掉,return =give back 所以,return--give也行;
let‘s take turns playing the game
playing---play
take turns to do 轮流做.
he listened carefully but listened nothing
listened---heard
前者表示动作,后面表示结果.
the little boy doesn't be afraid of animals any more
doesn't be------isn't
be afraid of 害怕.
doesn't------shouldn't 也行,小男孩儿不应该再害怕动物了.
he is enough rich to buy his son a new watch
enough rich---- rich enough
通常要后置.

I should return the book to the library at once.
Let's play the game.
he listens carefully
the little boy doesn't afraid the animals any more
he is enough rich to buy a new watch to his son

I should take the book back to the library at once
Let's round to play this game
he listened carefully but hears nothing
the little boy wouldn't be afraid of animals any more
He has enough money to buy a watch for his son

I should return the book to the library at once (return有还回的意思，不需要再加back)
let‘s take turns to play the game (take turns to do sth.)
he listened carefully but heard nothing (listen 是听的意思，...

1去掉back
2 playing to paly
3 listened nothing heard nothing
4 doesn't be isnit
5 enough rich rich enough

I should return the book to the library at once
let‘s take turns to play the game
he listened carefully but heard nothing
the little boy isn't be afraid of animals any more
he is rich enoughto buy his son a new watch