1.those boy students like football while these women teachers like vollyball.为什么boy不用复数,但是women要用复数?
2.i have many ten-dollars in my pocket,为什么ten dollar 之间要加-?
3.jack is a friend of my father's.为什么father后面要加‘s?of不是已经是所属格了吗?
4.let's share the apple.i shall cut it in half.为什么是in half,不能是in pieces?
5.would you like try to a second time?为什么是a,不是the?