| 1 | I have already registered to participate in this competition. | |
| 2 | They both registered for the same course at the same time. | |
| 3 | The event only has a limited number of spots, so sign up quickly. | |
| 4 | My classmates all signed up for the charity event. | |
| 5 | You need to fill out a form in order to complete the registration for this project. |