How many years have you worked here?____ten years ago.为什么不能用Before而要用since?

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How many years have you worked here?____ten years ago.为什么不能用Before而要用since?

How many years have you worked here?____ten years ago.为什么不能用Before而要用since?
How many years have you worked here?____ten years ago.
为什么不能用Before而要用since?

How many years have you worked here?____ten years ago.为什么不能用Before而要用since?
ten years ago是一个时间点,也就是十年前.而加上before,那就是10年前还要之前,光从意义上来讲就行,你说对不?
before指的是某个时间点以前的时间,而since指的是某个时间点以后的时间.
这里很明显是说从十年前到现在,所以用since.
希望我的解释你能明白.

since,现在完成时的标志