Answer:
15. (can't see)
16. present tense
17. imperfect tense/past tense
18. conditional tense/future tense
Explanation:
16. is present tense cuz it means that "We wake up" and that action is what they have done at present.
17. is imperfect tense/past tense cuz it says that " I was going" and that action was already done and finished. That action used to happen.
18. is conditional tense/future tense cuz it says that "We would say" and that action is the action which we wish to do or it might happen.
hope it helps
and ur welcm
