1.
I write tests twice a week.
I do not write tests twice a week.
Do you write tests twice a week?
2.
I wrote a test yesterday.
I did not write a test yesterday.
Did you write a test yesterday?
3.
I shall write a test tomorrow.
I shall not write a test tomorrow.
Will
you write a test tomorrow?4.
I am writing a test now.
I am not writing a test now.
Are you writing a test now?
5.
I was writing a test at that moment.
I was not writing a test at that moment.
Were you writing a test at that moment?
6.
I shall be writing a test tomorrow.
I shall not be writing a test tomorrow.
Will you be writing a test tomorrow?