陷阱3 误解名词性物主代词的单复数意义
名词性物主代词mine, yours, his, hers, its, ours, theirs等作主语时，谓语动词的数取决于该动词后面名词的数，即动词后面的名词是单数形式，谓语动词用单数形式；动词后面名词为复数形式，谓语动词用复数形式。如：
His is a new bike. 他的是一辆旧自行车。
Ours are old bikes. 我们的是些新自行车。
陷阱4 误解某些不定代词的单复数意义
有些不定代词，如all, some, none, most, any等，当它们用作主语时，若指复数概念，谓语动词用复数形式；若指单数概念，则谓语动词用单数形式。如：
Not all work is difficult. 不是所有的工作都难。
Not all the students are here. 不是所有的学生都在这儿。
【针对训练】
选择最佳答案填空：
1. Look! There ________ some apples in that tree.
A. is B. was C. are D. were
2. —There ________ a charity show this weekend. Would you like to join us?
—Of course. I’d love to.
A. is B. has C. will be D. will have
3. —What is the weather like this summer here?
—There ________ very little rain.
A. has B. has been C. are D. have been
4. Tom with other boys ________ to go and ________ the game.
A. want, watch a B. wants, watches C. wants, watch D. want, to watch
5. —How many students are there in your school?
—________ the students in our school ________ over two thousand.
A. The number of; is B. The number of; are C. A number of; is D. A number of; are
6. Neither the students nor the teacher ________ in the classroom at that moment.
A. were B. was C. weren’t D. wasn’t
7. —What ________ the number of the girls in your class?
—About twenty.
A. is B. am C. are D. be
8. Both Lily and Lucy ________ to the party yesterday.
A. invited B. was invited C. had invited D. were invited
9. ________ the books in our library ________ about 20,000.
A. The number of, are B. A number of, is
C. The number of, is D. A number of, are
10. The workmen ________ busy ________ the small parts together in the workshop.
A. is, with B. are, putting C. is, putting D. be, with