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

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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 because I was halping my moth
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