Learn Farsi: آیا جلسه‌ی فردا ساعت ده صبح است؟ - Is tomorrow's meeting at ten in the morning?

In English, we say "at ten o'clock", but Farsi doesn't use a preposition for time here. You just state the time directly: ساعت ده acts as both "ten o'clock" and "at ten o'clock".

How does Farsi say "in the morning"? Do I need a preposition like "in"?

No, just like with "at", Farsi doesn't use "in the" for times of day. You simply place the word for morning (صبح) right after the time. ساعت ده صبح literally means "hour ten of morning".

Why does جلسه (meeting) have a ی added to the end to make جلسه‌ی فردا?

To link "meeting" (جلسه) and "tomorrow" (فردا), we need the connecting sound called the ezâfe. Because جلسه ends in a silent "h" that makes an "e" sound, we must add a "y" sound to bridge the two words. That is why it is written as جلسه‌ی فردا and pronounced "jalese-ye fardâ".

Is the word آیا always required to ask a yes/no question?

No. آیا is a formal question word used at the start of yes/no questions to make it very clear a question is being asked. In everyday spoken Farsi, people usually drop it entirely and just raise their tone of voice at the end of the sentence.