Step 2 Grammar: agreement
谓语动词在人称和数上必须和主语一致
1.由合成代词some(any, no, every) + thing(body, one )作主语，由代词each, no, one, either, another, the other作主语，以及限定词either, neither, each, every, many a, more than one等+名词作主语时均跟单数谓语动词。例如：
Someone is crying outside.
No one but me knows him.
Many a boy likes football.
More than one student has gone home
2. pair(kind, type, form, glass, box) + of 等表示数量的短语修饰主语时，谓语要与pair等一致。
These two pairs of shoes are of the same color.
This pair of shoes fits me very well.
4. trousers, glasses, scissors等复数形式的名词作主语时用复数。
4．分数、百分数修饰可数或不可数名词作主语时，谓语取决于它表示的意义。
About 50 percent of the teachers are women.
Three-fouths of the earth is covered by water.
5. people, police, cattle等表示总称的名词作主语时，谓语用复数。
The police are fighting with the thief.
No people are allowed to enter by the back door.
6.both, few, , afew, many, several等表示复数概念的不定代词作主语时，谓语用复数。
Several of the pears are bad, and several more have worm holes.
Few people live to be 100 hundred.
8. None of them have /has a car.
Neither of them know / knows the answer.
9. 就近原则
Either you or she has stolen my wallet.
Neither…nor… / not only…but also…
10. There is an apple and three pears on the table.
There are three pears and an apple on the table.
11. 主语后接together with, along with, with, except, as well as, rather than, but, like等短语时， 谓语动词不受其影响。
The teacher, as well as two students, was in the room.
No one except my parents knows anything about it.
12．示时间、距离、金钱、重量等复数名词作主语时， 通常作整体看待，谓语动词用单数。
One hundred miles is not a long distance.
Ten dollars is enough.
13. 四则运算中， 谓语动词单复数均可
Five times five is /are twenty-five.
Two and two make/makes four.
14. 用形式或不定式作主语时， 谓语动词用单数。
Climbing the mountains is very tiring.
To get rid of smoking is very difficult.
15 集体名词如（army, class, enemy, family, team, committee, government, group等）做主语时， 谓语动词视情况采用单，复数
His family is not very large.
His family are all music lovers.
16.主语中有and时， 如果表示单一概念用单数动词，否则用复数
The iron and steel industry plays an important part in our national economy.
To mean to do something and to actually do something are two separate things.
Bread and butter is liked by children.
