中考英语易混词语用法讲解：call in/call on/call off

　　call in/call on/call off

　　1. 拜访

　　I shall call on you next week.

　　我下星期去看你。

　　2. 号召;请求

　　You'd better call on your friends to help you.

　　你最好请朋友来帮你。

　　2,call in

　　1. 请求收回;请来

　　3,call off

　　1. 取消

　　Why was the football match called off?