Question

I left out two sentences. Thank you.
1) I take the clothes out (and not: I take out the clothes?)
2) You mustn't speak during the lessons/during lessons/during your school hours/during your school classes.
3) You must be in class when the teacher arrives.
I have to separate dark clothes from light ones (Is that correct?)

Answer 1

I take the clothes out of the dryer.

2 is OK, but parts are wordy. I'd write --
during lessons
during school hours
during classes

3 is OK.