改错：we have studied English for about six years since I have become a middle school student.
人气：214 ℃ 时间：2020-02-04 00:06:16
解答
have become改为became很感谢，似乎有点理解了。可以讲讲since自从什么时候是要用现在完成时，什么时候后面是接过去式啊？since 后的句子过去式，since 前面是现在完成时态 since 后可以跟1过去式的句子since I was born 2 段时间加ago 比如since 3 years ago 3 点时间，比如since 2008
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