happen是一個(gè)動(dòng)詞，一般都是指已經(jīng)發(fā)生了的事情，所以慣用What happened這樣的過去式。如：What happened? You seem nervous.發(fā)生什么啦？你似乎很緊張。

happen的用法例句：

1.Remember, keep a positive attitude and good things will happen.

記住：保持樂觀的心態(tài)，好事自然會(huì)發(fā)生。

2.Do not wait for good things to happen to you. You need to walk towards happiness.

不要等待好事降臨，你要向幸福進(jìn)發(fā)。

3.This is such an unforeseeable situation that anything could happen.

這種情況很難預(yù)測(cè)，什么事都有可能發(fā)生。

4.I go all tingly when I think of what might happen.

我一想到可能發(fā)生的事就滿心歡喜。

5.He couldn't help worrying obsessively about what would happen.

他禁不住時(shí)刻擔(dān)心將會(huì)發(fā)生的事情。

6.When events happen that shake these beliefs, our fear takes control.

當(dāng)一些事情的發(fā)生動(dòng)搖這些信念時(shí)，恐懼就會(huì)占據(jù)我們的心靈。

7.Lucy shut her eyes so she wouldn't see it happen.

露西閉上了眼睛，這樣就不會(huì)看到它發(fā)生了。

8.Deep inside the awareness was stirring that something was about to happen.

內(nèi)心深處隱隱感覺到有什么事即將發(fā)生。

9.She wondered what would happen if her parents found her.

她不知道如果父母找到自己會(huì)有什么結(jié)果。

10.To start with, where and when did it happen?

首先，這事發(fā)生在何時(shí)何地?