| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb pp] [prep] what could | 13 |
|
| 2 | [verb] to what could | 9 |
|
| 3 | [v-ing] [prep] what could | 7 |
|
| 4 | [to-vb] [prep] what could | 5 |
|
| 5 | [vb past] [prep] what could | 5 |
|
