if 后加动词表被动 是if being done 还是if done或者2者都有?
问题描述:
if 后加动词表被动 是if being done 还是if done
或者2者都有?
答
对两者都有,
那天刚看过,if done是简化了的,一般都不用前面的了,old了:)
答
if done
答
if it was done,if it was being done,if done都可以