英语主谓一致

用and连接时就用复数，就把那些不定式呀什么的当名词看，然后原则相同，因为他们本身已经名词话了

用are 因为有许多个主语时,主语是复数

and连接用复数，or 连接用单数（如：TO be or not to be )

用and连接主语时谓语用复数，用or 连接主语时谓语用单数

谓一致是中学英语的一项重要语法内容,也是高考必考的语法点之一。虽然主谓一致涉及的语法规则有多条,但面临高考的同学应特别关注以下几点:
一、动词不定式短语、-ing形式短语或名词性从句作主语时,谓语动词一般用单数形式。但what引导从句作主语时,在下列情况下,主句谓语动词多用复数形式:①表语为复数名词时;②what引导的从句是一个具有复数意义的并列结构时。如:

Learning new words and useful expressions is very important for me.

What he’d like is a digital watch.

What we have to learn are the pieces of language that produce inversion.

What I say and think are no business of yours.

二、在定语从句中,关系代词作主语时,谓语动词的数常与其先行词保持一致。但在“one of +复数名词+定语从句”的结构中,从句的谓语常用复数形式;而在“the (only) one of +复数名词+定语从句” 的结构中,从句的谓语常用单数形式。试比较:

I was one of the persons in my office who were invited.

I was the(only) one of the persons in my office who was invited.

三、“分数/百分数+ of + 名词”作主语时,谓语动词的数要与of后面的名词保持一致。如:

Two-fif