| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | was [verb] on at the time | 5 |
|
| 2 | was going on at the time | 5 |
|
| 3 | was go on at the time | 5 |
|
| 4 | was [v-ing] on at the time | 5 |
|
