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1、2020年12月大学英语四级语法知识整理【篇一】2020年12月大学英语四级语法知识整理用于现在完成时的句型1)It is the first / second time. that结构中的从句部分，用现在完成时。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结构，that 从句要用现在完成时.This is the best film that Ive (ever) seen.这是我看过的的电影。This
2、is the first time (that) Ive heard him sing.这是我第一次听他唱歌。【篇二】2020年12月大学英语四级语法知识整理比较since和forSince 用来说明动作起始时间，for用来说明动作延续时间长度。I have lived here for more than twenty years.I have lived here since I was born.My aunt has worked in a clinic since 1949.Some new oilfields have been opened up since 1976.I hav
3、e known Xiao Li since she was a little girl.My brother has been in the Youth League for two years.I have not heard from my uncle for a long time.注意：并非有for 作为时间状语的句子都用现在完成时。I worked here for more than twenty years.(我现在已不在这里工作。)I have worked here for many years.(现在我仍在这里工作。)小窍门：当现在完成时+一段时间，这个结构中，我们用下面的
4、公式转化，很容易就能排除非延续动词在完成时中的误使。1)(对) Tom has studied Russian for three years.= Tom began to study Russian three years ago, and is still studying it now.2)(错) Harry has got married for six years.= Harry began to get married six years ago, and is still getting married now.显然，第二句不对，它应改为 Harry got married si
5、x years ago.或 Harry has been married for six years.【篇三】2020年12月大学英语四级语法知识整理since的四种用法1) since +过去一个时间点(如具体的年、月、日期、钟点、1980, last month, half past six)。I have been here since 1989.2) since +一段时间+ agoI have been here since five months ago.3) since +从句Great changes have taken place since you left.Considerable time has elapsed since we have been here.4) It is +一段时间+ since从句It is two years since I became a postgraduate student.