I have started the English classes since three weeks ago. 这句话为什么是错的?错在哪?

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IhavestartedtheEnglishclassessincethreeweeksago.这句话为什么是错的?错在哪?IhavestartedtheEnglishclassessincethre

I have started the English classes since three weeks ago. 这句话为什么是错的?错在哪?
I have started the English classes since three weeks ago. 这句话为什么是错的?错在哪?

I have started the English classes since three weeks ago. 这句话为什么是错的?错在哪?
start是瞬时动词,表示一瞬间的动作,后不能跟since+一段时间
因为一start就结束了,你不能保持开始这个动作,保持三周,同例如：come
这些瞬时动词后,都不能与段时间连用
如：I have come to China for 1 year.(错）
I have been in China for 1 year.(对)
原句应改为 I have had the English classes since 3 weeks ago.
表示三周前持续发生一直延续到现在的动作
have class 上课 after class 下课 in class 在上课

I started the English classes three weeks ago.
== I have been in the English classes for three weeks / since three weeks ago.

started
不能走　have　started
start是一瞬间的动作，不能延长，所以不能走　have　done

start是瞬间动词，不能和表示一段时间的短语since three weeks ago这样的短语连用在一起，必须把它变成与之相对应的延续性动词形式，应该改成：I have been on the English classes since three weeks ago. 或I started the English classes three weeks ago.

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