單數的主詞：下列句子中的主詞視同單數
- Twenty years is a long time.
- A million dollars is a lot of money.
- Many a boy is in the playground now. = Many boys are in the playground now.
- More than one person is in the hall.
- News (politics/ economics/ mathematics/ linguistics) doesn’t interest me at all.
複數的主詞：下列句子中的主詞視同複數
- The police have arrested the suspect.
- Poultry are raised everywhere in the countryside.
- The crew are working hard to row the boat.
- People nowadays spend a lot of money on electric appliances.
用單數動詞表達整體，用複數動詞表達全部個體的集合的字：
class / family / audience / committee
例句：
His family is a big family. His family are all teachers.
A large audience was in the auditorium last night. All the audience were moved.
The + Adj. (表達抽象意義) 視為單數主詞
The + Adj. (表達全部屬性的人) 視為複數主詞
例句：
The good is an important part of human nature. 善良是人性中重要的一部分。
The rich are not always happy. 富有的人不會永遠快樂。
下列表達由B決定動詞為單數或複數動詞，因為最靠近動詞。
- A or B + 動詞…
- Either A or B + 動詞…
- Neither A nor B + 動詞…
- Not only A but (also) B + 動詞…
例句：
Her older sister or parents have a successful business.
Either May’s parents or her sister has a successful business.
Neither the twin brothers nor their father was seen at the park yesterday.
下列表達由A決定動詞為單數或複數動詞，因為介系詞片語在句中位置可改變。
- A with B + 動詞…
- A as well as B + 動詞…
- A no less than B + 動詞…
例句：
The father dog with its four baby dogs comes into the village for food every day.
(說明：主詞the father dog是第三人稱單數，因此動詞come加上s。)
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