thenumberof后是加复数形式还是单数后加

the number of…意思是“……的数字/数目”，介词of同其后名词构成介词短语，修饰the number.当它作主语时，谓语动词用单数。

1、The number of business failures has risen.企业倒闭的数量增加了。

2、The number of independent firms decreased from 198 to 96.独立公司的数量从198个减少到了96个。

3、The drug increases the number of red cells in the blood, enhancing oxygen uptake by 10 percent.这种药增加了血液里的红细胞数量，从而将摄氧量提高了10%。

4、The number of unemployed people in Poland has grown by more than a quarter in the last month.上个月，波兰的失业人数增长超过了1/4。

5、After eleven days of growth the number of sprouts was counted.经过11天的生长后，对新芽的数量进行了计数。a number of和the number of的区别1、意思不同a number of 相当于a lot of，many，意思是：许多，一些。the number of意思是......的数。The number of sick students is decreasing.生病学生的数量在减少。A number of students are sick today. 今天一些学生病了。

2、用法不同a number of后面动词用复数，the number of后面动词用单数。A number of houses were burnt down in the fire.在火灾中，许多房子给烧毁了。The number of business failures has risen.企业倒闭的数量增加了。

3、名词用法不同the number of表示“……的数目（号码）”，of后跟复数名词。a number of相当于many，意为“许多”，后跟复数名词或代词。number前可用large，small等修饰，以表示程度。The number of students in this class is 40.（正）这个班的学生数是40。A number of students are planting trees on the hill．许多学生在小山上植树。