一般疑问句
Does Mrs.Sawyer usually stay at home in the morning?
The children usually (do their homework)in the evening(针对打括号的提问）
What do the children usually do in the evening?
Her daughter is (playing in the garden).(针对打括号的提问）
What is her daughter doing?
The children are swimming in the river.(变成一般疑问句）
Are the children swimming in the river?