| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] what [modal v] | 2049 |
|
| 2 | [v-ing] [prep] what | 1155 |
|
| 3 | [v-ing] what [modal v] | 191 |
|
| 4 | [v-ing] [prep] [modal v] | 32 |
|
