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英语语法疑问TheleasepriceincludesmaintenanceandcollisioninsuranceThecostofthisarticleincludespackagingThise-mailtransmissionmaycontainconfidentialinformation为什么include有些加s,有些不加?请讲解语法

题目详情
英语语法疑问
The lease price includes maintenance and collision insurance
The cost of this article includes packaging
This e-mail transmission may contain confidential information
为什么include有些加s,有些不加?
请讲解语法
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答案和解析
include有些加s,有些不加.是要看主语是单复数的,不是想加就另的.如第一句主语是price 是单 数要加S.第二句主语The cost也是单 数也要加S.第三句主语是音是单 数,但contain前有情态动词may 要原形.
意吧.我是从事英语的,不明再问.