I have had a computer since I went there 如果把since 和其后画上线是用when还是how long提问?

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I have had a computer since I went there 如果把since 和其后画上线是用when还是how long提问?
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I have had a computer since I went there 如果把since 和其后画上线是用when还是how long提问?
I have had a computer since I went there 如果把since 和其后画上线是用when还是how long提问?

I have had a computer since I went there 如果把since 和其后画上线是用when还是how long提问?
How long 一般对现在完成时提问
when一般对一般过去时提问

how long
When 对一个时间点进行提问,不是对一段时间。

用how long 提问

how long 对一段时间提问。since I went there 自从我去哪儿(有一段时间了)
When 对一个时间点进行提问,I get up at 7:00 in the morning 当对at 7:00in the morning 提问时多用When 祝学习进步,更上一层楼!