what （are） those people doing thay are talking with with each other 为什么要用are 不用do
问题描述：
what （are） those people doing thay are talking with with each other 为什么要用are 不用do
what （are） those people doing
thay are talking with each other .
答
因为是现在进行时,结构应该是：be+动词ing