Present Perfect vs Past Simple
Mary has travelled/travelled since she graduated high school.
Mary HAS TRAVELLED since she graduated high school.
She + to have
she had
she + to have
she has had
At 6 P.M., he has had/had a snack.
At 6 P.M., he HAD a snack
they + to study
they studied
they + to study
they have studied
She has cried/cried for 2 hours.
She HAS CRIED for 2 hours
we + to know
we knew
Surprise!
+300 points for the losing team!
Ups!
Surpise! -400 points
That's too bad!
you + to take
you took
you + to take
you have taken
The movie came out last week. Mark didn't see/hasn't seen the movie.
The movie came out last week. Mark HASN'T SEEN the movie.
I + to win
I won
I + to win
I have won