1.在one of ＋复数名词＋定语从句的结构中，定语从句一般被看作修饰复数名词，因此该从句中的谓语要用复数形式。
eg:The Atlantic Ocean is one of the oceans that separate the Old World from the New.
2. separate from从...分开、分离
eg:We separate the good ones from the bad.我们把好的与坏的分开
3.keep sb from doing sth:使...不要...，阻止某人做某事
eg:It is really not easy to keep Father from smoking.
同样意思的词组还有：
stop sb from doing sth
prevent sb from doing sth
4.make sb do sth:
使意动词(主动)+人+（省略了to）do sth.
be 使意动词(被动)+人+to do sth.
其它使意动词还有
get sb do sth
let sb do sth
have sb do sth
5. make sb. unwilling to do sth：使得某人不愿做某事
eg：His indifference to work made everybody unwilling to cooperate with him.
6.be afraid of doing, be afraid that:害怕
7. （倍数/半数+）as+adj+as：（倍数/半数）与…一样
8. so+adj+冠词+名词单数
9. few,a few可数，后面加可数或者复数名词。
few几乎没有，a few有一点儿.
little, a little不可数，后面加不可数名词。
little几乎没有，a little有一点儿.
10. so+形容词/副词+that:如此…,以至于…
such+(不定冠词)名词/名词短语+that: 如此…,以至于…
11. fell into下落，流入
12. It takes sb sometime to do sth:花费某人…时间做某事
13. dry up：干涸
14. on the average：平均而言
15. range from to：范围从…到…
range：山脉，范围，幅度，变化.
16. reach up：挤压形成
17. affect:v. 影响；打动；（疾病）侵袭
effect：n. 影响，作用，效果
18.pile up:堆积
19.seem to:似乎
