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　　英语语法专项

　　1.如果主语是不可数名词，动名词，不定式或从句的时候，谓语动词用单数。

　　Smoking is not a good habit.

　　To live happily needs a lot of things.

　　What I said is true.

　　2.如果由and连接的两个做主语的单数名词指的是同一个人或物的时候，用单数动词。

　　The singer and songwriter is dead.

　　The science and technology plays an important part in China.

　　Bread and butter(=buttered bread) is a good food for patients.

　　“War and Peace” is the best book I have ever read.

　　如果由and连接的两个或更多的主语之前有each,every,many a/an,no的时候用单数名词。

　　Every boy and girl in the class works very hard.

　　Each minute and second is valuable to us.