since后面加什么时态，有几种时态？
since后面加时间点，表示现在完成时。
需要注意的是，since所连接的时间点必须都是过去的时间。
since +过去一个时间点（如具体的年、月、日期、钟点、1980、last month、half past six）。例如：
I have been here since 1989. 1989起，我一直在这儿。
扩展资料
词义辨析
since，after，in这三个介词都可指示时间关系，表示“在…之后”。其区别是：
after可表示从过去时间算起的一段时间之后，往往与过去时态连用（若接表示时间点的词，也可与将来时态连用）；
in则表示从现在时间算起推移到将来的一段时间之后，一般与将来时态连用；
since所表示的时间往往是从过去某一点时间一直延续到说话的时间，因而一般与完成时态连用。
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