They have learned English for eight years 。他们已学了八年的英语了。
So far weve only discussed the first five chapters。至今我们还只讨论了前五章。
几点注意
1)一个句子应该用什么时态只能取决于它需要表达的意思,以及它所处的语言环境。例如:
He speaks English 。(一般现在时,说明动作发生的经常性。)
He spoke English when he was in New Zealand 。(一般过去时,说明动作发生的时间。)
He is speaking English。(现在进行时,说明动作正在进行。)
He has spoken English for three years since he came to the USA。(现在完成时,这里说明动作的总和。)
He has been speaking English since he came to the USA. (现在完成进行时,强调动作的连续性。)
2)在含有时间状语从句或条件状语从句的主从复合句中,如果主句的谓语动词是一般将来时,那么从句的谓语动词就只能用一般现在时来表示将来时;如果主句的谓语动词是过去将来时,那么从句的谓语动词就只能用一般过去时来表示过去将来时。
例如:I will not play tennis if it rains tomorrow。
I would not play tennis if it rained the next day。
3) 有些动词表示无法持续的动作,它们一般不宜用于进行时态中。这类动词常见的有:be , believe , consist , find , forget , hate , have , hope , hear , know , like , love , notice , prefer , remember , see , seem , smell , suggest , taste , understand , want , wish , sit down , stand up 等等。
【初中英语语法动词八种时态详解:现在完成时】相关文章:
最新
2016-02-29
2016-02-29
2016-02-29
2016-02-29
2016-02-29
2016-02-29