Don't know how to translate 1-8 and don't know if they are right

All of them are right but number two

1) We came back at six in the afternoon.

2) lots of students take the spanish class.

3) Rose and Laura don't wait for Manuel.

4) You talk with the boys in the students residence.

5) Jaimes father WORKS in the lab.

6) I search for a book in the library.

7) Rebecca and you need luggage to travel.

8) Our teacher Reyes teaches the Spanish class.

What’s the needed here?