How to use "fail" in a sentence

But, in the event that the Congress shall fail to take one of these two courses, in the event that the national emergency is still critical, I shall not evade the clear course of duty that will then confront me

I must not fail Maxim now.

You're too good to fail."

And the past two weeks, I've dreamed about him every night without fail

He was determined not to fail on this assignment

I fail to see any association."