1) Present means that is happening now. Past means that something happened in the past. It usually ends in -ed. Past means that something happened in the past.
2) Present: Jennifer is throwing the ball to Crystal. Passed Tense: Jennifer threw the ball to Crystal.. Future tense: Jennifer is going to throw the ball to Crystal.
3) Present: Our boss tells everyone about the rules. Past Tense: Our boss told everyone about the rules. Future Tense: Our boss is going to tell everyone about the rules.
4) Past Tense: I ate dinner at 6:30. Future Tense: I will eat dinner at 6:30. I am eatingt dinner at 6:30.