Correct
I play football yesterday.
I played football yesterday.
you/last Monday/at home?
Were you at home last Monday?
I got lots of e-mails last yesterday.
I didn't get lots of e-mails yesterday.
Were Sergey and his father at the same university?
Yes...
Yes, they were.
They didn't finish their course.
They finished their course.
I go to work last Monday.
(no emphasis)
I went to work last Monday.
get married/e/last month?
Did he get married last month?
I was in New York in 1991.
Did your father work for Google?
No,
No, he didn't.
Their family and friends didn't help them.
Their family and friends helped them.
I didn't won a prize at the competition.
I didn't win a prize at the competition.
Did his father teach maths?
I used the internet every day last week.
I didn't use the internet every day last week.
Was George at the same university as his uncle?
No,...
No, he wasn't.
He didn't write him a cheque.
He wrote him a check.
I have a car in 1991.
(no emphasis)
I had a car in 1991.
He/as his parents/at the same university?
Was he at the same university as his parents?
It was easy for people to find information.
It wasn't easy for people to find information.
Did you leave the USA in 1991?
Yes,
Yes, I did.
Search engines weren't very good in 2010.
Search engines were very good in 2010.
They didn't happy at the party yesterday.
They weren't happy at the party yesterday.
Larry's parents/computer science/teach?
Did Larry's parents teach computer science?
Mark Zuckerberg launched Facebook in 2004.
Mark Zuckerberg didn't launch Facebook in 2004.
Did you help your wife with the kitchen yesterday?
Yes,.....
Yes, I did.
They weren't happy with the name "BackRub".
They were happy with the name "BackRub".