Respostas
a - those are the students who need to improve their grades
b - this is the video which went viral on the internet
c - we spend two weeks with our grandparents when we are on vacation
d - this is the place where we are used to studying together
e - this is the actor whose movies are unbelievable
Resposta: a)Those are the students who need to improve their grades.
b)This is the video which went viral on the internet.
c)We spend two weeks with our grandparents when we are on vacation.
d)This is the place where we are using to study together.
e)This is the actor whose movies are unbelievable.
Explicação: O pronome relativo which significa que e é usado para representar coisas ou animais. Who é usado para representar pessoas. Where é usado para representar lugares. When significa quando, usado para representar tempo. Whose significa cujo e é usado para substituir um termo da oração.