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2019英語(yǔ)六級(jí)語(yǔ)法知識(shí)：need "不必做"和"本不該做"
英語(yǔ)六級(jí)語(yǔ)法知識(shí)：need "不必做"和"本不該做"
didn't need to do表示： 過(guò)去不必做某事, 事實(shí)上也沒(méi)做。.
needn't have done表示： 過(guò)去不必做某事, 但事實(shí)上做了。
John went to the station with the car to meet Mary, so she didn't need to walk back home. 約翰開(kāi)車(chē)去車(chē)站接瑪麗，所以她不必步行回家了。
John went to the station with the car to meet Mary, so she needn't have walked back home. 約翰開(kāi)車(chē)去車(chē)站接瑪麗，所以她本不必步行回家了。 (Mary步行回家，沒(méi)有遇上John的車(chē)。)
典型例題
There was plenty of time. She ___.
A. mustn't have hurried B. couldn't have hurried C. must not hurry D. needn't have hurried
答案D。needn't have done. 意為"本不必"，即已經(jīng)做了某事，而時(shí)實(shí)際上不必要。
Mustn't have done 用法不正確，對(duì)過(guò)去發(fā)生的事情進(jìn)行否定性推斷應(yīng)為couldn't have done, "不可能已經(jīng)"。 must not do 不可以(用于一般現(xiàn)在時(shí))。
2019英語(yǔ)六級(jí)語(yǔ)法知識(shí)：用于現(xiàn)在完成時(shí)的句型
英語(yǔ)六級(jí)語(yǔ)法知識(shí)：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.