| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [was/were] going on at the [noun sg] | 9 |
|
| 2 | [was/were] [v-ing] on at the [noun sg] | 9 |
|
| 3 | was [v-ing] on at the [noun sg] | 8 |
|
| 4 | [was/were] [v-ing] on at the time | 5 |
|
