Twenty dollars is not enough to buy this book .
There are twenty dollars on the desk .
2. 分数 / 百分数 +of + 名词作主语时,谓语动词的单复数形式由名词的单复数形式决定。如:
Two thirds of the students in this school have been admitted to universities .
Two thirds of the water has been polluted in this river .
3. all / some / most / none of + 名词作主语时,谓语动词的单复数由名词的单复数形式决定,但 none of+ 名词复数作主语时,谓语动词可以用单数形式也可以用复数形式。如:
All the leaders were present at the meeting .
None of your answers is / are right .
4. many a / more than one + 单数名词作主语时谓语动词用单数形式。如:
Many a student has passed this difficult exam .
5. a number of + 名词复数作主语时,谓语动词用复数形式,而 the number of + 名词作主语时谓语用单数。如:
A number of boy students are football fans .
The number of the students in this school has been increasing these years .
6. a / this kind / type / sort 等 + of + 名词作主语时,谓语动词要用单数形式,但复数名词 +of +a / this kind / type / sort 等作主语时谓语动词要用复数形式。如:
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