Because you have all failed to work together to get the job done.

In that case, why did the equipment fail to work?

Without the last part, the whole system has and will fail to work.

Funny, how even simple plans so often fail to work.

Then a video camera sent below to look around failed to work.

In two of those games, he failed to work beyond the third inning.

As he had more than half expected, the weapon failed to work.

In her experience, most things like that failed to work.

But the process failed to work several of the times I tried it.

"How can it fail to work well when I have so much help from you all?"