before 时间点是什么时态的标志

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。

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…), 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