本文重点讲解:happen, an amount of, amounts of的用法。
Happen: 发生； 出现； 碰巧； 偶然遇到；
1.表示“某地(某时)发生了什么事”,
常用“sth.+ happen +地点/时间”
A Car accident happened on the street yesterday .
2.表示“某人出了某事(常指不好的事)”,
要用“sth.+ happen+to sb.”
A car accident happened to her this morning.
今天上午她发生了交通事故.
What happened to you?你怎么啦？
3.表示“某人碰巧做某事”, “sb.+ happen+ to do sth.”
I happened to meet Tom in the street yesterday.
昨天我碰巧在街上遇到了我的一个朋友；
4.happen表示“碰巧或恰巧发生某事”时，
还可用“It happens / happened that……”
It happened that I was out when he called.他来访时我碰巧不在。
5. happen为不及物动词，不能用于被动语态。
不能说：The story was happened last year.
但可以说：The story happened last year.
6. happen为短暂性动词，不能与表示一段时间的状语连用。
不能说：This happened for one year.
但可以说：This happened one year ago.
An amount of， Amounts of 区 别
两个词组翻译成，“大量的”，
1.修饰不可数名词， 不可以修饰可数名词,
做主语时，谓语动词单复数依据amount单复数确定
2. an amount of + 不可数名词:
作主语时，谓语动词使用单数
An amount of water is needed for the trees.
这些树需要大量的水。
3. Amounts of + 不可数名词：
做主语时，谓语动词使用复数
Amounts of money were spent on the school．
在学校上花了大量的钱。
4.amount可以被large, great, good, huge等词修饰
a large amount of water is needed for the trees.
Large amounts of money were spent on the school．
