| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [to-vb] out what [is] going on | 28 |
|
| 2 | [to-vb] out what [is] [v-ing] on | 28 |
|
| 3 | [to-vb] out what [is] go on | 28 |
|
| 4 | to find out what [is] [verb] on | 22 |
|
| 5 | [to-vb] out what 's [verb] on | 18 |
|
| 6 | [to-vb] out what is [verb] on | 10 |
|
