公共英語二級考試語法精選講解

　　引導(dǎo)語：下面是小編整理的一些公共英語二級考試的語法精選講解，語法盲的同學(xué)可要認(rèn)真看看啦，小編覺得學(xué)習(xí)語法要掌握規(guī)律，循序漸進(jìn)，這樣才能更好地把握語法要領(lǐng)。

　　比較過去時與現(xiàn)在完成時

　　現(xiàn)在完成時可表示持續(xù)到現(xiàn)在的動作或狀態(tài)，動詞一般是延續(xù)性的，如live, teach, learn, work, study, know.

　　過去時常用的非持續(xù)性動詞有come, go, leave, start, die, finish, become, get married等。

　　舉例：

　　I saw this film yesterday.

　　(強(qiáng)調(diào)看的動作發(fā)生過了。)

　　I have seen this film.

　　(強(qiáng)調(diào)對現(xiàn)在的影響，電影的內(nèi)容已經(jīng)知道了。)

　　Why did you get up so early?

　　(強(qiáng)調(diào)起床的動作已發(fā)生過了。)

　　Who hasn't handed in his paper?

　　(強(qiáng)調(diào)有卷子，可能為不公平競爭。)

　　She has returned from Paris.

　　她已從巴黎回來了。

　　She returned yesterday.

　　她是昨天回來了。

　　He has been in the League for three years.

　　(在團(tuán)內(nèi)的狀態(tài)可延續(xù))

　　He has been a League member for three years.

　　(是團(tuán)員的狀態(tài)可持續(xù))

　　He joined the League three years ago.

　　( 三年前入團(tuán)，joined為短暫行為。)

　　I have finished my homework now.

　　——Will somebody go and get Dr. White?

　　——He's already been sent for.

　　句子中如有過去時的時間副詞(如 yesterday, last, week, in 1960)時，不能使用現(xiàn)在完成時，要用過去時。

　　(錯)Tom has written a letter to his parents last night.

　　(對)Tom wrote a letter to his parents last night.

　　用于現(xiàn)在完成時的句型

　　1)It is the first/second time…. that…結(jié)構(gòu)中的從句部分，用現(xiàn)在完成時。

　　It is the first time that I have visited the city.

　　It was the third time that the boy had been late.

　　2)This is the… that…結(jié)構(gòu)，that 從句要用現(xiàn)在完成時.

　　This is the best film that I've (ever) seen.

　　這是我看過的最好的電影。

　　This is the first time (that) I've heard him sing.

　　這是我第一次聽他唱歌。

　　典型例題

　　(1) ——Do you know our town at all?

　　——No, this is the first time I ___ here.

　　A. was　B. have been　C. came　D. am coming

　　答案B. This is the first time 后面所加從句應(yīng)為現(xiàn)在完成時，故選B.

　　(2) ——Have you ____ been to our town before?

　　——No, it's the first time I ___ here.

　　A. even, come　B. even, have come　C. ever, come　D. ever, have come

　　答案D. ever意為曾經(jīng)或無論何時，反意詞為never，此兩詞常用于完成時。This is the largest fish I have ever seen. It is/was the first time +that-clause 的句型中，從句要用完成時。

　　注意：非延續(xù)性動詞的否定形式可以與表示延續(xù)時間的狀語連用。即動作不發(fā)生的狀態(tài)是可以持續(xù)的。

　　(錯)I have received his letter for a month.

　　(對)I haven't received his letter for almost a month.

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