If I want ask Bob if he is hungry, do I use the same sentence?
You could add هل (hal) or ا (2a) at the beginning. 'hal anta ...' or '2a anta ...' (are/do you ...)
You listen to his tummy rumbling
You are hungry, Bob. Now, come to my restaurant.
Sounds like Pop not Bob
Why did it give me a typo for using You're instead of You are?
If you typed "you're" and it was marked wrong, report it. "You're" and "You are" have the same meaning in English. But if you accidentally typed "your" or "you'r" then that is an error.
Why is "you're" marked as mistaken?
In Arabic YA Bob means o bob(o used for someone present) and when I click YA it shows nothing (I hate duolingo)