----- Nội dung dịch tự động từ ảnh ----- Exercise 2: Change the sentences into affirmative (+); negative (-) and interrogative (?) forms. 1. They were in Rio last summer. (-) (?) 2. (+) She was my boss. (-) (?) 3. (+). (-) I wasn't at the concert last Sunday. (?) 4. (+) The hotel was very expensive. (-) (?)