| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which could [adv] [vb infin] [noun] | 20 |
|
| 2 | [Wh det] could [adv] [vb infin] [noun sg] | 16 |
|
| 3 | [Wh det] could only [vb infin] [noun] | 5 |
|
