To say that something is "at" a certain time, use alla or alle:
A che ora é la lezione ? ("At what time is the lesson ?")
La lezione é alle nove. ("The lesson is at 9 o'clock.")
La lezione é alla una. ("The lesson is at one o'clock.")
To ask for the time in Italian, use Che ora é ("What time is it?"). To ask what time something happens at, use A che ora ? ("At what time……?") as in A che ora é la lezione ?, or A che ora ritorni in università ? ("What time do you return to the university?").
To differentiate between AM and PM when telling time, Italian may add del mattino ("in the morning"), del pomeriggio ("in the afternoon"), della (di) sera ("in the evening") and della notte ("in the night") to describe what time of day being referred to. Usually this is clear from the context and is not specified explicitly. Another possibility is to use a 24-hour clock (this is always done officially, e.g. when calling for meetings, in train and plane timetables, etc.). So 9 o'clock PM becomes sono le nove di sera, while 9AM is sono le nove della mattina, and 5PM is sono le cinque del pomeriggio.
Questions and Question Words
Asking a yes or no question
There are many ways to ask questions in Italian, althoug there is no do-form as in En