Interrogative sentences differ from the declarative or interrogative ones by
some their specific features.
There are two structural types of interrogative sentences in Modern English -
general questions (yes- or no- questions) and special (or wh-) questions. Both of
them are characterized by having partial inversions:
Are we staying here?
Where are we staying?
Besides, the first one has a special (rising) intonation pattern. The second
one (wh-question) has interrogative words. But the intonation pattern of wh-
questions is identical with that of the affirmative sentences.
And it is important to point out that the interrogative sentences require
answers (if they are not rhetorical ones).