Unit 1: He is always happy.
Unit 2: It's usually warm in spring.
Unit 3: What do you usually do in the morning?
Unit 4: How often do you play the piano?
Unit 5: What do you want to buy?
Unit 6: How much is the backpack?
Unit 7: What date is it?
Unit 8: This is mine.
Unit 9: Whose glue is it?
Unit 10: What did you do yesterday?
Unit 11: Did you study yesterday?
Unit 12: You ate a slice of bread.