2: Viết các câu sau ở thể khẳng định (-), thể phủ định (-), thể nghi vấn (?) ở thì quá khứ đơn. (+) They decided to leave soon. (-) at the zoo. (+) (-) There were not many homeless people here ten years ago. (?) (+) (?) Did Tom's grandfather use to be a soldier? (+) My teacher started teaching here 6 years ago. (?) (+) Jane often went to school on foot 3 years ago. (?) (+) (-) The cat didn't want to eat yesterday. Did the train arrive late yesterday? (-) There wasn't anything left in the fridge. (?)
