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AUX
(have 和 has 与过去分词连用构成动词的现在完成时)
You use the forms have and has with a past participle to form the present perfect tense of verbs.
例句
Alex has already gone...
亚历克斯已经走了。
I've just seen a play that I can highly recommend...
我刚看了一场话剧，我强烈推荐。
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AUX
(had 与过去分词连用构成动词的过去完成时)
You use the form had with a past participle to form the past perfect tense of verbs.
例句
When I met her, she had just returned from a job interview...
我遇见她时，她刚参加完一场求职面试回来。
By Friday at 5:30 p.m., I still hadn't heard from Lund...
直到周五下午5点半，我仍未收到伦德的消息。
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AUX
(用于附加疑问句中)
Have is used in question tags.
例句
You haven't sent her away, have you?...
你还没有把她送走，是吗？
It's happened, hasn't it?...
这事儿已经发生了，是吗？
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AUX
(用于对带有 have,has 或 had 的句子作肯定或否定回答)
You use have when you are confirming or contradicting a statement containing 'have', 'has', or 'had', or answering a question.
例句
'You'd never seen the Marilyn Monroe film?' — 'No I hadn't.'...
“你从未看过玛丽莲·梦露的电影？”“对，没有。”
'Have you been to York before?' — 'Yes we have.'
“你们以前去过约克吗？”“是的，去过。”
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AUX
（having 和过去分词连用，所引导的分句中提到的动作发生在另一个动作开始之前）
The form having with a past participle can be used to introduce a clause in which you mention an action which had already happened before another action began.
例句
He arrived in San Francisco, having left New Jersey on January 19th...
1月19日离开新泽西后，他到了旧金山。
Having been told by his doctor that he was overweight, he's eating all the fibre and fruit he can.
被医生告知超重后，他一直拼命地吃高纤维食物和水果。