Question 28: Don't talk during the test. It can disturb others. (you)
→ If you talk during the test, it can disturb others.

Question 29: It's a good idea for her to set a schedule when she has a lot of homework. (should)
→ If she has a lot of homework, she should set a schedule.

Question 30: It's possible that Sam will join the soccer team when he practices regularly. (might)
→ If he practices regularly, he might join the soccer team.

Question 28:
Don't talk during the test. It can disturb others. (you)

→If you talk during the test, it can disturb others.

Question 29:

It's a good idea for her to set a schedule when she has a lot of homework. (should)

→If she has a lot of homework, she should set a chedule.

Question 30:

It's possible that Sam will join the soccer team when he practices regularly. (might)

→Sam might join the soccer team if he practices regularly