Naturally, people vary in their interpretations of what a poster is focused on.
I
didn't think that he wanted to know, as a matter of style, the best
question to ask if he were a doctor asking a patient about a
cough. But maybe he did.
I thought he was focused on the difference between the semantic implications of a gerund and an infinitive after start, particularly in that sentence. But maybe he wasn't.
In any case, considering the variety of approaches we've taken
in this thread, I'm sure that his concerns have been addressed,
whatever they were!
That's why it's always good when more than one answer shows up on these threads.
CJ