В прошлом времени:
I have not read this book.
Today I went to school.
I haven't talked to Misha.
I didn't like to drink in the childhood milk float.
I didn't want to go there.
В настоящем времени:
I don't know the math.
I don't want to walk.
Don't go to the gym.
I'm not doing homework.
I don't talk to Misha.