8. exist

vi. 存在，生存

existence n. 存在

Does life exist on Mars?

火星上有生命吗？

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I can hardly exist on the wage I’m getting.

我靠自己挣的工资简直难以糊口。

常用结构：

exist+prep. 存在于某地方

exist on sth. 靠某物生存

高手过招

用exist相关短语的适当形式填空

①This plant            only            Australia.

②Can you                               such a low salary?

③I doubt the                of alien.

答案：①exists; in②exist on③existence

重点短语

9. in time意为“及时”时相当于early enough, soon enough;意为“终于，早晚”时相当于sooner or later。

We got to the station just in time to catch the bus.

=We got to the station just in time for the bus.

我们到达车站时，刚好赶上了那班汽车。

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The doctor came in time to save her life.

医生及时赶来救了她的命。

Youll succeed in time if you keep on working hard.

假若坚持努力下去，你迟早会成功的。

联想拓展

be in time for sth./be in time to do sth.

对于某事是及时的/及时做某事

ahead of time提前；提早

all the time一直；始终

at one time曾经；一度

at a time一次

at times 有时

at the same time同时；然而；可是

from time to time不时；偶尔

in no time立刻；马上

take ones time不急，慢慢来