but says there are birds that fly,and fish that swim 为什么fly和swim要用原型?应该是flying吧?
问题描述：
but says there are birds that fly,and fish that swim 为什么fly和swim要用原型?应该是flying吧?
答
but says there are birds that fly,and fish that swim
没有错误的.that 后面跟的是定语从句.不过用V-ing 的话,可以用：flying birds,swimming fish.