isn't ,Who Sorry.Mr Chen isn'tin. Whois that,please?(接电话时用语) 对不起,陈先生不在.请问你是谁? (It's ) Peter here.(Where ) is Mr Chen? (He's ) in the school.Why?Isn't (it ) Saturday today?Yes.The students have no (classes )today,but there is a ball match ( between ) his class and Class 2....
