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 This is mine.
Unit 8 Whose glue is it?
Unit 9 I was sick yesterday
Unit 10 Did you study yesterday?
Unit 11 Where did you go last weekend?
Unit 12 When did you go there?