they are swimming ____(happy) in the river为什么填happily?有句式的话更好!
问题描述：
they are swimming ____(happy) in the river
为什么填happily?
有句式的话更好!
答
happily是happy的副词形式 用来修饰动词swim的
答
happily 副词修饰动词swim,swim happily 快乐地/高兴地游泳
happy是形容词,前用系动词,如:He felt/ was happy.