2. It's time for school
3. Tom is doing the experiment? yes.
本回答被提问者采纳It's time. to go to school.
Is Tom doing an experiment? Yes,he is
They are collecting leaves.
It's time to go to school.
Is Tom doing experiment? Yes, he is.
什么叫“Are the children doing?”
此句意思是“孩子们正在做吗?”
与题意风马牛不相及啊!
不能这样采纳的。