is 后面的动词 一定要用 ing 形式吗？

Question

看到这样一个句子，is后面的动词没用ing 该怎么解释呢？
What you've got to do is turn around and say : " Watch me".

Answer 1

is后面不一定要用ing，如be to do表示将来时，be did表示被动语态，例句中What you've got to do是主语，is是系动词，turn around and say : " Watch me"是表语，也就是说is和turn是分开独立的，不是黏在一起的，所以turn的形式是不受is影响的

Answer 2

is 后面的动词 不一定要用 ing 形式，要具体情况具体分析的呢
当为be+to do 为将要做某事，或是祈使句
在此What you've got to do is turn around and say : " Watch me".为一句祈使句，口头用语呢
turn around and say 是前面what you've got to do 的解释本回答被提问者采纳

Answer 3

What you've got to do 作句中的主语，is作谓语动词；turn...作其表语。