Change your role? or change your roles?

[karina1]

This is a dialogue in an English class.

Teacher : Let's role-play with your group. Take a role from the dialogue.
Let's watch the screen carefully and repeat the dialogue.
If your character is shown on the screen, you have to stand up.

Group 1 : (standing up) I can swim.
Group 2 : (standing up) I can play the piano.

Teacher : Good. This time, change your role and repeat the dialogue again.

Should it be "Change your roles" or "Change your role."?
Anyway, what's the difference between two?

Are there any errors in this dialogue? If so, please correct them.

Thank you.

 

[susiedq]

Either can be used.

The meaning would be:

each of you change your role
or
both of you change your roles

 

[riquecohen]

The teacher can also say "change roles."

 

[karina1]

Thanks first,
Just to be sure, technically in this context the teacher says to the students, not just one.
However, "Change your role." is fine grammatically?

I don't want to come off as petty, but this is a test question, and I need something obvious and sure to prove the answer wrong. I think "Change your role" is fine to students as well as to a student.

Thanks

 

[susiedq]

Yes;

All of you change your role.

(All is a collective noun in this sentence)