So our problem is that we have to work fast.

They would have to work fast to find the source.

Now, things generally don't work really fast in the military.

"From another point of view it could be said I work fast."

They must have worked fast to get it together, Charles thought.

Many people just try to work faster, but that doesn't really help.

Two separate things, so see whether we can work fast.

The position is hard one for you, but mind works fast as usual.

"I hope that they will work faster in the future."

Even moving the pen was hard, and my mind would not work fast.