115-现在完成时VS过去一般时

录音所用材料

过去一般时

1. 过去的动作行为

I wrote a letter yesterday.

2. 这样也属于过去

I knew it all along.

Oh, really? I didn't know about that.

如果别人给你讲了件事，你说I don't know about it. 不太合适哦，都讲完了还不知道，我百忙了？

现在完成时

1. 一件过去的事影响到现在

Father: Why are you watching TV? You should be doing your homework.

Son: I have finished my homework. So I am watching TV.

Your friend: Let's go and see the movie Titanic?

You: I have seen it.

Your friend: When did you see it?

You: I saw it yesterday.

2. 一件过去的事持续到现在

I have studied English for three years.

至于往后还学不学，没说，但截止到说话时，已经三年了。

对比分析

I have studied English for three years.

至于往后还学不学，没说，但截止到说话时，已经三年了。

I studied English for three years.

过去学过三年，显然现在没在学了。因为过去时不表明和现在的关系。

继续对比：

I have worked in the factory for a long time.

到现在为止很久了。

I worked in the factory for a long time.

之前在那里工作过很久。

总结

一件过去的事和现在有关系