那是由于结构：help sb.do 决定的,and 连接：clean the rooms 和 buy some things
所以buy 不加s
这句话的谓语动词是 helps,主语是Li Lei 第三人称单数,一般现在时动词也用三单,所以用helps
翻译：李雷通常帮父母打扫屋子并买些东西.
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Li Lei usually helps his parents clean the rooms and buy some things.
Li Lei usually helps his parents clean the rooms and buy some things.
and不是要前后一致的吗?为什么这个句子help加s,buy不加s
and不是要前后一致的吗?为什么这个句子help加s,buy不加s
英语人气：113 ℃时间：2019-11-07 17:08:45
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