1. Past Tense Forms
1.1. was
1.1.1. Yesterday around this time, his uncle was injured in the traffic accident.
1.2. were
1.2.1. A half of last year, I was staying with with my host family in France . I do love them so much because they taught me many things I haven't known and they treated me like their child.
2. Present Tense Forms
2.1. is
2.1.1. Betty is doing laundry in the laundry room.
2.1.2. Kristy is dating with the good-looking and handsome man in the luxurious restaurant.
2.1.3. The unknown tall man is standing behind Nicolas.
2.1.4. Mark Zeedle is having lunch and talking over with his colleagues in the office cafeteria.
2.2. am
2.2.1. I am surfing the internet in order to find some information for a group presentation.
2.2.2. While my mother's cooking in the kitchen, I'm making bed.
2.3. are
2.3.1. They are celebrating Peter's birthday party.
2.3.2. Michael, Rosy, Emma and Catherine are travelling to Singapore to join an international seminar.
3. Note: use to show the future event (all are the same)
3.1. be about to do something
3.1.1. They are about to start./ They are about to start the performance.
3.2. be going to do something
3.2.1. They are going to start./ They are going to start the performance.
3.3. be on the point of doing something
3.3.1. They are on the point of starting the performance.