| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could have [vb pp] [adv] in [noun] | 8 |
|
| 2 | could [vb infin] [vb pp] [adv] in [noun sg] | 6 |
|
| 3 | could [vb infin] [vb pp] [adv] in [noun] | 5 |
|
