He help his mother do housework.变过去式He help his mother do housework.怎么变过去式?

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He help his mother do housework.变过去式He help his mother do housework.怎么变过去式?
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He help his mother do housework.变过去式He help his mother do housework.怎么变过去式?
He help his mother do housework.变过去式
He help his mother do housework.怎么变过去式?

He help his mother do housework.变过去式He help his mother do housework.怎么变过去式?
He helped his mother do housework.
解析:help sb.do 是省to不定式,help后面的动词要跟原型,所以,过去时改为helped sb.do,不可以是help sb.did.

He helped his mother did housework

he helped his his mother do housework.

LS正解
He helped his mother do housework.

He helped his mother do housework.

He helped his mother do housework
分析:help+动词原形