题目内容：

if not和on condition (that) 是 连词短语吗

优质解答

1 if not:(是if 结构的省略形式)
- Will Mary go with you?
- I hope she will.But if not,I will go by myself.(if not== if she soesn't go with me)
2 on condition (that) == if （是连接词）
I will lend these books to you on condition (that) you take good care of them.