| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [v-ing] what [modal v] | 191 |
|
| 2 | [v-ing] what [vb mod] | 191 |
|
| 3 | [v-ing] [pron] must | 124 |
|
| 4 | [verb] what must | 55 |
|
| 5 | [v-ing] what must | 9 |
|
