why not give him a help?同义句转换

网友回答

Why don't you give him a hand?
Why don't you do him a favor?
Why not do him a favor?
======以下答案可供参考======
供参考答案1:
how about give him a help？
供参考答案2:
why not give him a hand ?
供参考答案3:
why not give him a hand ?