| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which could [verb] | 1536 |
|
| 2 | which could [vb infin] | 1534 |
|
| 3 | which [modal v] prove | 95 |
|
| 4 | [pron] could prove | 91 |
|
| 5 | which could prove | 25 |
|
