Be sure not to miss them if they come to a city near you---if you can get ticket,that is.

题目

Be sure not to miss them if they come to a city near you---if you can get ticket,that is.
not to miss中为什么加to?that is为何意?

答案

习惯用法啦 be sure to do something.只是在中间加了个not作否定.
关于that is,它的意思就是指的是它前面的话是补充作个解释.