George didn't go to London last weekend.

 Joe didn't wear his new jacket yesterday.

Pete didn't invite Fred to his birthday party.

You didn't send me an email.

Wendy didn't leave home before nine o'clock.

 My dad didn't study German at school.

George went to London last weekend
George didn't go to London last week.

Joe wore his new jacket yesterday

Joe didn't wear his new jacket yesterday

Peter invited Fred to his birthday party
Peter didn't invite Fred to his birthday party

You sent me an email
You didn't send me an email 

Wendy left home before nine o'clock
Wendy didn't leave home before 9 o'clock
My dad  had an amazing holiday

My dad didn't have an amazing holiday

Her brother studied English last night
Her brother didn't study English last night

 George didn't go to London last weekend.

 Joe didn't wear his new jacket yesterday.

Pete didn't invite Fred to his birthday party.

You didn't send me an email.

Wendy didn't leave home before nine o'clock.

 My dad didn't study German at school.