I’d like to know
a) when does the next sightseeing bus arrive.
b) when the next sightseeing bus arrives.

2 I was wondering
a) if I could take a subway to Madison Square Garden.
b) could I take a subway to Madison Square Garden.

3 Do you happen to know
a) if it’s possible to ride a bike in Central Park?
b) is it possible to ride a bike in Central Park?

4 Can you tell me
a) what time does the museum open today?
b) what time the museum opens today?

5 Do you know
a) if they arrange tours at the United Nations?
b) do they arrange tours at the United Nations?

6 Do you have any idea
a) what is the High Line?
b) what the High Line is?