初中英语时态知识点：现在完成时概念

1)表示过去发生的动作对现在造成的影响或结果.常与already, just, ever, never, before等词连用. 如:

She has never read this novel.

2)表示 过去的动作一直延续到现在并有可能继续延续下去. 常与for (后跟段时间)或since (后跟点时间)等连用.如:

I have been a member of the Party for 10 years.

I have been a member of the Party since 10 years ago.

注：在有for 和since 引导时间状语的句子中不能用短暂性动词，应用与之相应的表示状态的词。如：

He has died for 3 years.(F)

He has been dead for 3 years.(T)

注：①现在完成时不能和表示明确的过去时间连用。如：in 1998, last morning等

②have/has been to 表示去过（去了又回来了）

have/has gone to 表示去过（去了没回来了）

如：Where has she gone?(句中所指的人不在)

Where has she been?(句中作指的人在)