例句:
Using alternative fuels and improving energy efficiency is thus both an ecological necessity and a technological challenge.
两个非谓语形式并列之后作句子主语,如果表达同一概念,谓语动词用单数形式;如果表达不同的概念,谓语动词用复数形式。
Using alternative fuels and improving energy efficiency 两个事件指向同一个概念,而且表语是“一种必要,一种挑战”,表单数意义。
以下句子则是指两种情况,谓语动词用复数:
Working and living are two different things but they are always together. 工作和生活是两件不同的事情,但它们总是相辅相依
Listening, speaking, reading and writing are the important things you must do in learning a foreign language. 听、说、读、写是学习一门外语时必须做到的几件重要的事情
两个动名词并列用is还是are
复数 两个主语并列时表示的是复数 现在有些老师说得太绝对,他们总跟学生说“动名词作主语,谓语用单数”,实际上不完全是,一个动名词作主语,谓语用单数是对的,但是多个动名词作主语,谓语就用复数。 如: Playing sports is good for your health.