改错：we have studied English for about six years since I have

来源：学生作业帮编辑：神马作文网作业帮分类：英语作业时间：2024/11/17 10:17:51

改错：we have studied English for about six years since I have become a middle school student.

have become改为became
再问：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？
再答： 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

改错：we have studied English for about six years since I have I have studied English s____ I was six years old. 改正句子中的错误.i have studied English for three years since i had We have studied English (for about three years).对括号部分提问改错题:We have not met each other for about 20 years since we h We have studied English for 3 years.被动语态 They have studied english for six years改为否定.they english for I have studied English for 7 years.(同义转换) I have studied English for 7 years.同义句 you will have studied English for six years by the time you I have studied English or three years since I had come here. 1.They have studied English since 8 years.2.The