用一般过去时(表示过去的事实):
I helped my mother with housework the day before yesterday.
前天我帮妈妈做家务了
用将来时(对于将要发生的事,或计划,决定要做的事,皆以be going to+动词原形+...或will/shall的句型):
I'm going to help my mother with housework tomorrow.
I will/shall help my mother with housework tomorrow
明天我准备帮妈妈做家务