~~~should do it

~~~should do it how should I do? how should I do it? just test it,how should I do? we should do it again soon Should it happen,what would we do? You should do it by [ ][you] two teaspoons should do it什么意思 they should do it.at once .How should I do it?急用. 为什么这里不能用should do it? They should do it at once. it's requested that sb should do