1 They have an Art lesson every day. (改为否定句)
2 Kitty likes playing badminton. (改为否定句)
3 Open the window, please. (改为否定句)
4 There are some umbrellas behind the door. (改为单数句)
5 The Chens are having a holiday on the beach. (对划线部分提问) having a holiday
6 The cat eats cat food every day. (对划线部分提问) cat food
7 It’s warm in Shanghai in spring. (对划线部分提问) warm
8 They are in the post office. (对划线部分提问) in the post office.
9 Those round apples are Tom’s. (对划线部分提问) Tom’s.
10 teacher / having / park / the / a / are / in / picnic / the (连词成句)