before加时间点用于什么时态

文/叶丹

before用作连词,常用于过去时、将来时等,意思是“在……之前;还没来得及……就”。用于It+be+时间段+before...句型中,意思是“在……之后才……”。before用作副词,常用完成时。例如:I’ve seen the film Titanic before.我以前看过《泰坦尼克》这部电影。

before加时间点用于什么时态

几个基本时态标志词:

一、一般现在时:

标志:always, usually, often, sometimes, every week (day, year, month…), once a week, on Sundays,

结构:①be动词;②行为动词

二、一般过去时:

标志:ago, yesterday, the day before yesterday, last week(year, night, month…), in 1989, just now, at the age of 5, one day, long long ago, once upon a time, etc.

结构:①be动词;②行为动词

三、现在进行时:

标志:now, at this time, these days, etc.

结构:am/is/are+doing

四、过去进行时:

标志:at this time yesterday, at that time或以when引导的谓语动词是一般过去时的时间状语等。

结构:was/were+doing

五、现在完成时:

标志:recently, lately, since…for…,in the past few years, etc.

结构:have/has + done

六、过去完成时

标志:before,by,the end of last year(term,month)......

结构:had done

七、一般将来

标志:tomorrow,next day,soon,in a few minutes....

结构:1、be going to 2、will/shall do

八、过去将来时

标志:the next day,the following month

结构:1、be going to do 2、would /should do

这里列举的都是最基本的,具体题型中还有很多变化。