一、数量概念作主语时的主谓一致
[观察例句]
1．Five minutes isn't enough to finish this work.
2．Most of the workers are against the plan.
3．A number of students have made up their minds to take part in afterschool activities.
4．The number of students who have made up their minds to take part in afterschool activities is 120.
[归纳用法]
1．表示时间、距离、长度、重量等的复数名词短语作主语时，谓语动词用单数形式。
2．some，most，rest及分数、百分数等作主语时，谓语动词的单复数根据some等所代替的名词而定。
3．“a number of＋可数名词复数”作主语时，谓语动词用复数形式。但是，“the number of＋可数名词复数”作主语时，谓语动词用单数形式。
[即学即练1] 单句语法填空
①Many people say 1，000 dollars is(be)a lot of money.
②About 70 per cent of the earth's surface is covered(cover)with water.
③The number of the students in middle school is (be)increasing year by year.
④The rest of the girls are (be)fond of music.
