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

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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
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

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
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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这里buy和clean并列
help sb do

help sb. do sth.
这是固定结构
而后面的buy与clean并列
因此是clean和buy的原型
相当于help his parents clean and help his parents buy

help sb. do something.help 后面跟动词原形。

因为是动词,名词,动词句子。clean是动词,the rooms 是名词,所以在后面的buy就不用变语法了。(^___^)