| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | hear what was [verb] on | 11 |
|
| 2 | hear what [was/were] [v-ing] on | 11 |
|
| 3 | hear what [was/were] go on | 11 |
|
| 4 | hear what [was/were] going on | 11 |
|
