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

(P) Now, walking in the bright July sunshine, he felt sure that this years robbery was going to be as successful as all the others.

(Q) For two weeks he had been studying the house at Shotover Grange, looking at its rooms, its electric wiring, its paths, and its gardens.

(R) This afternoon the two servants, who remained in the Grange while the family was in London, had gone to the movies.