| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which could [vb infin] | 1534 |
|
| 2 | [verb] could [vb infin] | 339 |
|
| 3 | [verb] which could | 78 |
|
| 4 | [verb] which [vb infin] | 6 |
|
