He is supposed to be nice 中的to be 不定式在句中是作什么成分 什么语?

He is supposed to be nice 中的to be 不定式在句中是作什么成分 什么语? isn't it supposed to be very hot?中的be supposed to做什么成分 my dream is to be a hostess in CCTV 中的不定式做什么成分 He is easy to be fat句中的to be fat作什么成分? This needs to be studied carefully.不定式to be studied在句子中做什么成分 he seemed to be very happy.这里不定式作什么成分? 不定式be to可以充当句子中什么成分 英语语法问题be+形容词+to do 中的to do 是不是动词不定式,在句中作什么成分呢? be+形容词+that 从 be supposed to do什么意思? he is a difficult man to please.这句话中的不定式在句子中充当什么成分? He is lucky to win the first prize.这句话中的动词不定式作什么成分, it's your turn to be on duty 不定式在句中做什么成分