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1. They are singing in the classroom. (改为一般疑问句并作肯定回答和否定回答)
一般疑问：____________________
肯定回答：_______________ 否定回答：_________________
2. They are doing housework. (分别改成一般疑问句和否定句)
______________________
______________________
3. The students are cleaning the classroom. (改为一般疑问句)
______________________
4. I’m playing the football in the playground. (对划线部分进行提问)
______________________
5. Tom is reading books in his study. (对划线部分进行提问)
______________________
同类型试题
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
