since引导的从句中谓语动词可以是过去完成时么?可以的话给个例句吧。

我是说since后面的句子。。。

可以。 现在完成时表示从过去持续到现在，而过去完成时表示从过去持续到过去。
例如： He has live in the city since 1990. (现在还住在这座城市)
The old man died last year. He had lived in the city since 1990. (从过去到过去，他已经不在了)

你好！ it is three years since he left here it was three years since he had left here 希望对你有所帮助，望采纳。