1.由and 连接的两个单数名词作主语时，谓语动词一般根据意义一致的原则用复数。如：

July and August are the hottest months in Beijing.

七月和八月是北京最热的月份。

The black and the white dog are always barking.

那条黑狗和白狗总是叫个不停。（当and所连接的两个名词相同而修饰词不同时，第一个名词通常省略，而谓语动词用复数）

注意：但如果在意义上指同一个人、同一件事或同一个概念时，谓语动词要用单数形式。如：

A needle and thread was found on the floor.

在地板上找到了针线。（穿了线的针）

The poet and writer has come.

那位诗人兼作家来了。（同一个人，既是诗人又是作家）

2.当each…and（each）…，every…and（every）…，no…and（no）…，many a…and（many a）…结构作主语时，谓语动词用单数形式。如：

Every boy and every girl is treated in the same way.

每个男孩和女孩都受到同样对待。

Many a teacher and student has seen the film.

许多老师和学生看过这部电影。

No desk and（no）chair was in the room.房间里没有书桌和椅子。

3.由not only…but also…，either…or…，neither…nor…，…or…，not…but…连接的并列主语，以及在there be结构有and连接的并列主语时，谓语动词通常依就近一致原则决定。如：

Were you or he on duty？你还是他值日？

Neither her brother nor her parents were in favor of her marriage.

她哥哥和她父母都不赞成她的婚姻。

Not only she but also I am tired.不但她很累，我也很累。

There is a pen，a knife and several books on the desk.

桌上有一支钢笔，一把小刀和几本书。

4.当主语由as well as，with，along with，together with，rather than，no less than，but，except，besides，in addition to，like，including等词连接时，其谓语动词的单复数形式通常由前面的词来决定。如：

Gold，as well as silver，has risen in price.金，还有银，价格都上升了。

The president，accompanied by his secretaries，has arrived.

董事长，在秘书们的陪同下，已经到了。

Tom，along with his friends，goes skating every Saturday.

每个星期六，汤姆和他的朋友们一起去滑冰。

He no less than we is very glad at the news.

他和我们听到这个消息都感到很高兴。

No one except the manager has the right to decide.

只有经理才有权做出决定。