不定式的形式中进行式是哪两个?
问题描述：
不定式的形式中进行式是哪两个?
一个是to be doing,另一个是to have being doing还是to have been doing?
新东方的网络课程上写的是to have being doing
望高手作答,谢
答
to have been doing
没有to have being doing的形式,应该是网络课程的资料有误