I think english is important 改成疑问句和否定句怎么变?

Is English important?
I don't think English is important.
Does Tom enjoy his life every day?
Tom doesn't enjoy his life every day.
Do they fly to London every week?
They don't fly to London every week.
Did i do my homework last night?
I didn't do my homework last night.
Did we draw a lot of pictures yesterday?
We didn't draw a lot of pictures yesterday.