Doc tried to say something and found that no words would come.

The gunmen were not even expecting Doc to try it.

Doc tried to take the sting out of his voice, and was not entirely successful.

Doc had been trying to count the number of muties in the camp.

Doc tried to decide if it were or not.

When Doc tries to run, one of them shoots him.

Even when Doc tried to talk him out of it.

I didn't come here to play word games with you, Doc, so don't try to divert me from the point.

But Doc did not try to upset the boat.

Doc did not try to stop him talking.