He is helping his mother to do the housewok.
（因为句中的help是动词，动词后面接要做的事情时必须用to连接）
He is helping his mother with the housework.
（使用with 代替to do ）
he is helping his mother do the housework.
he is helping his mother whih housework.
he is helping his mother do the housework.
he is helping his mother to do the housework.
帮助某人有三种方法表达
he is helping his mother do the housework
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