I missed that exciting game, because mother said I couldn't watch before my homework was finished.
我错过了那场激动人心的比赛，因为妈妈说我完做作业才能看电视。
I haven't finished my homework because I was helping my mother at home all day yesterday.
我作业没做完是因为我昨天一直帮妈妈在家干活。
I haven't finished my homework yet, I was helping my mother in the kitchen all day yesterday.
我还没完成作业，我昨天一整天都在帮妈妈干厨房活。
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