用一般過(guò)去時(shí)代替完成時(shí)

1)　兩個(gè)動(dòng)作如按順序發(fā)生，又不強(qiáng)調(diào)先后，或用then，and，but 等連詞時(shí)，多用一般過(guò)去時(shí)。

When she saw the mouse，she screamed.

My aunt gave me a hat and I lost it.

2 ) 兩個(gè)動(dòng)作相繼發(fā)生，可用一般過(guò)去時(shí);如第一個(gè)動(dòng)作需要若干時(shí)間完成，用過(guò)去完成時(shí)。

When I heard the news, I was very excited.

3)　敘述歷史事實(shí)，可不用過(guò)去完成時(shí)，而只用一般過(guò)去時(shí)。

Our teacher told us that Columbus discovered America in 1492.

用于現(xiàn)在完成時(shí)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(shí)。

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(shí).

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

這是我看過(guò)的最好的電影。

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

這是我第一次聽(tīng)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(shí)，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(wú)論何時(shí)，反意詞為never，此兩詞常用于完成時(shí)。 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(shí)。

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

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

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

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