since 和 when在现在完成时中的区别
比如 I have been skating since I was7 years old 为何不能用when 什么时候用when
多举几个例句 然后分别说明主句从句接什么时态
别复制长帖子 3Q
人气：273 ℃ 时间：2020-02-27 03:06:50
解答
since指从过去一时刻到现在：I have been skating since I was7 years old .
when强调时间点：I had finshed my homework when he go home.
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