| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] [verb] what was going on | 8 |
|
| 2 | [vb mod] [verb] what was go on | 8 |
|
| 3 | [vb mod] [verb] what was [v-ing] on | 8 |
|
| 4 | [vb mod] [vb infin] what was [verb] on | 8 |
|
