2. 1. e (Past Continuous)
2. c (Present Simple)
3. b (Future Simple)
4. d (Past Simple)
5. a (Present Continuous)
4. Our friends often visit the theater.
a) Tag-question
Our friends often visit the theater, don't they?
b) General question
Do our friends often visit the theater?
c) Alternative question
Do our friends often visit the theater or the cinema?
d) Special questions
1) How often do our friends visit the theater?
2) What do our friends often visit?