I have to do the homewoek 这个句子中的不定式做什么成份?求解答

I have to do the homewoek 这个句子中的不定式做什么成份?求解答 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 I am sure to do it.其中to do it是不定式做这个句子的什么成分? 像be +adj+to+do这样的句型中不定式是做什么成份? I's adj(形容词） to do 句中的to do 做什么成份 帮我分析这句话 请问这个句子中,形容词做什么语法成分?不定式做什么语法成分?I feel very lucky to have him. I don't have enough time to spend with her.中的动词不定式做什么成分 the work to be finished is hard .的不定式做什么成份 to tell you the truth,I don't believe him.中的不定式做什么成分 "It's sure to do"的“to do”在句子中做什么成份 I have many things to do.请问to do在句子里做什么成分? Do you have something important to say?to say做什么成份