请问My job is only to look after the children.这个句子中的动词不定式作什么成份理解比较好?另外请问My only hope is to continue my study.这一句里动词不定式充当的成份也是和上述句子一样吗?还有You are

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请问My job is only to look after the children.这个句子中的动词不定式作什么成份理解比较好?
另外请问My only hope is to continue my study.这一句里动词不定式充当的成份也是和上述句子一样吗?还有You are to finish it by six.这样的句子里的动词不定式呢?

表语从句,前面有系动词is