she是主语 helped是谓语 her mother是宾语 cook dinner 是宾语补足语 yesterday是时间状语
因为help sb do sth 所以这里cook用动词原形
没有 只有过去分词形式
一般情况下,过去式表示主动的动作,而过去分词表示被动含义
she helped her mother cook dinner yesterday.
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