请问英语这是什么结构?what you need is a good meal.既然不是疑问句,这里what起什么作用?

(what) you really need is a good meal and a good rest.为什么用wh 请教一个英语句子结构what I need is nothing but a few days' rest.请问这句英语 what do you think should go into a good meal? What we need( ) good textbooks.A is what you need is a lesson in small talk.句型结构,主谓宾是哪些,what作什么成 what you need is a little more effort 是什么句型 Is that really what you think he wants? is that起什么作用 直接用what “A is to B what C is to D”句型,what起什么成分作用?这是从句吗? What you need is only a good rest."的中文意思? What I need is a bath and a good sleep What he wants is that.中的what起什么作用? what he said is boring.中what起什么作用?