was not后加动词什么形式

这个要看情况而定,以下加法都可以：
1.加Ving形式,此为过去进行时的否定句.
如：I was not doing my homework at this time yesterday.
昨天这个时候我没有在做作业.
2.加V-ed形式,此为一般过去时的被动语态结构的否定句.
如：The bridge was not built last year.
去年这座桥没有被建.
3.加不定式to do sth,此为过去将来时或不定式做表语的否定句.
如：He said that he was not to pay a visit to Beijing.
他说他不会去参观北京.
或：My dream was not to become a scientist when I was young.
我小时候的梦想不是成为一名科学家.
所以,其后动词形式没有固定加法,必须根据句意等采纳进行具体确定.

ing

be doing sth表示正在做某事
be to do sth表示打算计划做某事

---------ing