Thu and Lan are students. => They
My father and I are teachers.  => We
My book is here => It
His pencils are there  =>They
Are you and Nam a student ? - câu này nhầm đề rồi nhé bạn, you and Nam là 2 chủ ngữ só nhiều thì không có " a" nhá
=> You

Thu and Lan are students.
My father and I are teachers.
My book is here
His pencils are there
Are you and Nam a student ?
-> They are students.
We are teachers.
It is here
They are there
Are you and him a student ?

Thu and Lan are students.
=>They are students.
My father and I are teachers.
 =>We are teachers.
His pencils are there.
=>They are there.
My book is here.
=>It  is here.
Are you and Nam a student?
Câu này nhầm đề rồi bạn nhé! Vì you and Nam là hai chủ ngữ, số nhiều nên ko có a

1. they
2. we
3. it
4. they
5, they