Question

(2/2)这是个错句） 句子1中be动词后面可以加副词back,为什么2中不能使用副词happily

Answer 1

句子在哪?

副词也可作表语的,表示主语的方位、方向、动作情况.如：

Is there anybody in?

I must be off now.

When the meeting is over,I'll ring you.