I believe it's good for your health改为否定句I ()()()good for your health

I believe it's good for your health改为否定句I ()()()good for your health
it's important that we should eat vegetables every day 用to do 改为疑问句 it's important()()()()vegetables every day
He should go to bed early 对go to bed early 提问（）（）he （）?
we should help her with writing letters 改为否定句 we()help her with writing letters