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

(P) The oldest man in the world could not make head or tale of the time of day by such a watch, and so I went again to have the thing repaired.

(Q) This person said that the crystal had got bent and the mainspring was not straight.

(R)  She would reel off the next twenty-four hours in six or seven minutes and then stop with a bang.