问题描述：
请按规则在下列动词末尾加S
1.call__ 2.colour__ 3.borrow__ 4.drink__
5.wash__ 6.match 7.touch__ 8.watch__
9.pass__ 10.guess__ 11.catch__ 12.teach__
13.do__ 14.go__ 15.play__ 16.buy__
17.carry 18.try__ 19.worry__ 20.fly__
怎么判断`````
1.call__ 2.colour__ 3.borrow__ 4.drink__
5.wash__ 6.match 7.touch__ 8.watch__
9.pass__ 10.guess__ 11.catch__ 12.teach__
13.do__ 14.go__ 15.play__ 16.buy__
17.carry 18.try__ 19.worry__ 20.fly__
怎么判断`````
问题解答：
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