I haven't finished my homework because I was halping my moth

来源：学生作业帮编辑：搜搜考试网作业帮分类：英语作业时间：2024/04/28 10:10:48

I haven't finished my homework because I was halping my mother all day yesterday.那个是主句?

I haven't finished my homework 主句
because I was halping my mother all day yesterday.原因状语从句
再问：那如果改成hadn’t finished，后面用什么时态？
再答：这里不适合用过去完成时，因为all day yesterday 明确的过去的时间状语

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