Can someone help me with this?

Hello! 1. Tienen (plural because “estudiantes” is plural). 2. Tienen (“ellos” so plural). 3. Tiene (one person so singular). 4. Tengo (one person in first person). 5. Tienes (tu). I hope this helps!

And where is the

I'm not sure if you mean for us to translate or to answer. but i'll translate as these are questions for you to answer. 1. how long has it been since you've read a book? . 2. how long has it been since you've eaten breakfast? . 3. how long has it been since you've talked with your spanish professor?