Helped 和 clean 都没错.
过去 :He helped his mother to clean the house just now.
To的后面放回原字,没错.而且过去的一般后面会放个时间如just now,last night,yesterday,就想我补上的那样.
现在：He helps his mother to clean the house.
he helped his mother clean the house.这句话对吗?主要是helped和clean
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