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Had is the past tense and past participle of have .
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AUX
（had 有时代替 if 用于从句句首，表示某种情况可能发生但并未发生）
Had is sometimes used instead of 'if' to begin a clause which refers to a situation that might have happened but did not. For example, the clause 'had he been elected' means the same as 'if he had been elected'.
例句
Had he succeeded, he would have acquired a monopoly...
要是他当时成功了，他就会取得垄断地位。
Had I known what the problem was, we could have addressed it.
如果我当时知道问题出在哪里，我们就可以设法解决了。
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PHRASE
上当受骗
If you have been had, someone has tricked you, for example by selling you something at too high a price.
例句
If your customer thinks he's been had, you have to make him happy.
要是顾客感觉自己当了冤大头，你就得设法让他消气。
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PHRASE
遇到大麻烦;无望成功
If you say that someone has had it, you mean they are in very serious trouble or have no hope of succeeding.
例句
Unless she loses some weight, she's had it...
除非她减点儿肥，否则她就没戏了。
He wants actors who can speak Welsh. Obviously I've had it.
他要的是会说威尔士语的演员。明摆着，我是没指望了。
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PHRASE
受够了;忍受不了
If you say that you have had it, you mean that you are very tired of something or very annoyed about it, and do not want to continue doing it or it to continue happening.
例句
I've had it. Let's call it a day...
我受不了了。今天就到这儿吧。
I've had it with that kind of treatment of Americans.
我再也忍受不了那样对待美国人了。