before you can say knife

• 突然

before you can say knife的用法和样例：

例句

1. I must say the news comes as a total surprise.
   我得说这个消息来得太突然了。
2. He suddenly drew a knife and threatened me with it.
   他突然拔出刀来威胁我。

词汇搭配

• before you can say "knife" 说时迟那时快...
• before you can say Jack knife 马上