Three sentences are given. You need to find if they are grammatically correct or incorrect and mark the answer accordingly.

(P) It would run a while and then stop a while, and then run a while again, and so on, using its own discretion about the intervals.

(Q) And every time it went of it kicked back like a musket. I padded my breast for a few days but, finally, took the watch to another watchmaker.

(R)  He picked it all to pieces and turned the ruin over and over under his glass, and then he said there appeared to be a fresh start