since的用法

Sincethen前后一般接现在完成时,表示从那以后。例句:Ford has changed since then. 自从那以后,福特有了变化。

since的用法

1、Since作为介词后接某一确定的时间点，主句谓语动词是持续性动词，常与现在完成时态、现在完成进行时态或过去完成时态连用。

例如：

He left the village in 1982 and I haven’t seen him since then.1982年他离开这个村子，从那以后我再没见过他。

She’s been working in a bank since leaving school.她中学毕业后就一直在一家银行工作。 He had spoken to her only once since the party. 自从那次聚会以来，他只跟她说过一次话。

2、Since作为副词 表示从过去以来、以后或到现在的情形或状态，常与现在完成时态连用。

例如：

He left home two weeks ago and we haven’t heard from him since. 他两周前离开了家，到现在我们一直没有他的消息。

He came to Zhenjiang 6 years ago and has lived here (ever) since.他6年前来到镇江，从此便住在这里。

since then一般用什么时态

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的用法例句：

Since then, he has developed another bad habit.

从那以后,他养成了另一种坏习惯。

He hasn't come close to those numbers since then.

自那以后，他从没有达到那赛季的表现。

Ah, times are greatly changed since then!'

“啊，从那时起，世道可变得多厉害呀！”