how long的用法

how long有以下两个主要意思:

1、表示多长时间，对一段时间进行提问。

-Howlong have you learned English?

-你学英语多久了？

-For 3 years ./Since 3 years ago./Since I came to this school.

-三年了。/从三年前开始。/从我来到这所学校。

2、表示某东西有多长。

-How long is the river?

-这条河有多长?

-About 500 km.

-大约500千米。（大约）

-It’s 500 km.（确定）

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