what引导的名词性从句做主语时，主句谓语动词的单复数情况：
(1)What在从句中做主语，主句谓语由what从句谓语决定。
1) What he’d like most for a birthday present is a camera.
(2)what在从句中做宾语，主句谓语由主句表语/宾语决定what they want are XX,XX&XX。
2) What his father left him are a few English books.
如下面的句子：
What you need is a good meal.
如果表语是复数，
那么is就得变成are
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