I have to look after her at home.
三，have 做助动词与动词的过去分词一起构成现在完成时和过去完成时。
Great changes have taken place the last two years.
They said that the Arab had stolen their camel.
四．have 用于“情态动词+have +过去分词”的结构有推测，假设之意
1, must +have+过去分词，表示对过去时间发生的动作或存在的情况的推测，一般用于肯定句。
Her father thought that she must have met a fairy.
You must have left your bag in the theatre.
2,can (could)+have+过去分词，表示对过去发生事情的“不肯定”，常用于否定句和疑问句。
He can’t have been to your home, he doesn’t know your address.
3,should+have+过去分词，表示“某事本该早做而实际未做，”用于肯定句。
You should have been here five minutes ago.
五，have 用于某些成语，表示固定的意思。
1，have a word (a few words ) with sb,表示和某人説（几）句话。
Where’s Peter ? I want to have a word with him.
2, had better +不带 to 的动词不定式，表示“…最好…”
I’d better go and look for him now.
3, have nothing (something) to do with 表示“和…无（有）“关系。
Most of questions had nothing to do with Edison’s lesson.
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