since then 后面的时态可以用过去完成时吗

then本身是个过去的时间点,since then表示从那个时间点到现在的情况,一般是现在完成时.

例如I have not gone there since then.I have been there since then.It is 30 years since then.所以99%的情况是不用过去时的。

since then的用法

since then意为 \"从那时以来\"，通常与动词的现在完成时连用，指从过去某一时刻起到现在为止的\'一段时间。

Since then 前后一般接现在完成时，从那以后，现在完成时表示过去的某件事对现在还有影响， 现在完成时的标志性时间状语already , ever , never , yet , just , before, still , lately ,since , for a long time ,up to now, until,so far,in the last few years/weeks/mouths , till now,recently.