Here's the classification of the markers for Present Simple, Present Continuous, and Past Simple:
| Present Simple | Present Continuous | Past Simple |
|---|---|---|
| 1) on weekdays | 6) this week | 11) last month |
| 2) twice a day | 7) look! | 12) last year |
| 3) usually | 8) at the moment | 13) in 1987 |
| 4) hardly ever | 9) right now | 14) two years ago |
| 5) often | 10) listen! | 15) yesterday |