3. 動(dòng)名詞，不定式，從句作主語(yǔ)的時(shí)候，謂語(yǔ)動(dòng)詞一般要用單數(shù)
To see is to believe.
Swimming is a good way to keep health.
Who is her father is not known.
4. 集體名詞作主語(yǔ)時(shí)
a) mankind/humanity/man(人類)作主語(yǔ)的時(shí)候，謂語(yǔ)動(dòng)詞一般用單數(shù)形式
Only man knows how to cook.
b) 由people, police, cattle, youth等集體名詞作主語(yǔ)的時(shí)候，謂語(yǔ)動(dòng)詞用復(fù)數(shù)形式
The cattle are grazing in the field.
c) Family, croud, class, public, enemy等集體名詞作主語(yǔ)的時(shí)候
i. 若當(dāng)整體看，則謂語(yǔ)動(dòng)詞用單數(shù)形式
Our class is very diligent.
ii. 若他們表示的人或者事物當(dāng)作若干個(gè)個(gè)體來看，謂語(yǔ)動(dòng)詞則用復(fù)數(shù)形式
When I came into the room, his family were watching TV.
iii. A family/group/class作主語(yǔ)時(shí)，謂語(yǔ)動(dòng)詞用單數(shù)
families/groups/classes作主語(yǔ)時(shí)，謂語(yǔ)動(dòng)詞用復(fù)數(shù)
A group is coming to the zoo.
5. 其他情況
a) 主語(yǔ)為表示距離、時(shí)間、長(zhǎng)度、價(jià)值、金額、重量等復(fù)數(shù)名詞的時(shí)候，謂語(yǔ)動(dòng)詞用單數(shù)形式
3 kilometers is not very far.
Three times three makes nine.
b) one, every/each one, each, anyone, either, neither + of + 復(fù)數(shù)名詞
謂語(yǔ)動(dòng)詞一般用單數(shù)形式，因?yàn)閛f之后的復(fù)數(shù)名詞不是主語(yǔ)而是介詞of的賓語(yǔ)，of前面的one, every one … 才是主語(yǔ)
Neither of them is right.
Each of them has a slide.
c) none of + 不可數(shù)名詞——謂語(yǔ)動(dòng)詞用單數(shù)形式
none of + 可數(shù)名詞——謂語(yǔ)動(dòng)詞單復(fù)均可
None of that money in the desk is his.
None of his classmates knows the truth.
d) 分?jǐn)?shù)或百分?jǐn)?shù) + of + 詞組
分?jǐn)?shù)或百分?jǐn)?shù)+ of +詞組作主語(yǔ)時(shí)，謂語(yǔ)動(dòng)詞的數(shù)取決于of后的名詞或者代詞的數(shù);若名詞或代詞是復(fù)數(shù)，謂語(yǔ)動(dòng)詞用復(fù)數(shù)，若名詞或代詞是單數(shù)，則謂語(yǔ)動(dòng)詞用單數(shù)
Three-thirds of the surface of the earth is sea.
Tens of tons of waste goes into the air with the smoke every day.
e) more than one +(單數(shù)名詞)+單數(shù)動(dòng)詞
more than two +(復(fù)數(shù)名詞)+復(fù)數(shù)動(dòng)詞
More than one white rose has bloomed.
More than two white roses have bloomed.
f) a (great) number of + 復(fù)數(shù)名詞 ——用復(fù)數(shù)動(dòng)詞
the number of + 任何名詞 —— 用單數(shù)動(dòng)詞
A great number of tourists have been to the Great Wall.
The number of students in the computer class is limited to ten.
g) the + 形容詞，表示一類人 ——謂語(yǔ)動(dòng)詞用復(fù)數(shù)
the + 形容詞，表示一類物 ——謂語(yǔ)動(dòng)詞用單數(shù)
The rich are for the decision but the poor are against it.
The beauty is here.
h) every, any, some, no 構(gòu)成的復(fù)合詞someone, somebody, something ，no one, nobody, nothing everyone, everybody, everything anyone, anybody, anything這些復(fù)合詞作主語(yǔ)的時(shí)候，謂語(yǔ)動(dòng)詞用單數(shù)形式
Everyone in the class was surprised at the news.
Listen, someone is knocking at the door.
