1. exist vi. 存在；生存

　exist on (=live on) 靠......为生

　exist as作为......而存在；以......形态存在

　exist in(=lie in) 存在于......之中

　There exist(s)... 有/存在......

2. existence n. 存在

　in existence现存的，现有的

　come into existence产生；成立；开始存在

　bring into existence使发生；使产生

3. existing adj. 目前的，现存的 【特别提醒】

exist是不及物动词，没有被动语态，也不用于进行时态。

巩固练习

1. 完成句子

　①The bird often ______________ its eggs in other birds' nests.

这种鸟常把蛋产在其他鸟的巢里。

　②He would ______________ some money aside for rainy days.

他把一些钱放起来以备用。

③The naughty boy ______________ (lie) to me that the hen that ______________ (lie) there just now had ______________ (lay) two eggs the day before.

那个淘气的男孩对我谎称刚才卧在那儿的那只母鸡昨天下了两个蛋。

　④He ______________ his hand on my shoulder just now.

　他刚才把手放在我的肩上。

　⑤Who should we ______________ the blame on?

　我们该责备谁?

　⑥He is always______________ stress on the importance of being on time.

　他一直强调准时的重要性。

2. The worker earned little money a month, so he had to ____________ only fast noodles.

　A. exist on　 B. exist in C. lie in　 D. lie on

3. 完成句子，一空一词

　①____________ ____________ a generation gap between the young and the old.

　青年人和老年人之间存在着代沟。

　②You can't imagine what difficulty they have existing ____________ the money he's earning.

　你无法想象他们靠他挣的那点钱维持生活是多么困难。

③Scientists have many theories about how the universe first came into____________ (exist).