I have a question on past perfect sense... must it always come at the beginning? For instance: He had become sick even before the disease set in. (here 'had' is in the first half of the sentence). He became sick before the disease had set in. (here, 'had' is in the second).
Are both forms okay, or is there some rule regarding this?
Also, this example:
d) He turned angry enough to kill. He had turned angry enough to have killed.
Is that correct, the simple past and past perfect respectively? I am assuming 'turned' is followed by 'to' while 'had turned' is followed by 'to have'?