sylyr
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不一定,有时用不定式也行,如 Her job is looking after these children = Her job is to look after these children = 她的工作是照看这些孩子;
特殊情况下,用动词原形也行,如 What he first wants to do is thank his parents = 他首先想要做的事是感谢他的父母.
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sylyr
有时动词过去分词也可以做表语,但意思有所不同,如 He is gone = 他已经走了;English is widely spoken = 讲英语现在很普遍。