| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] [pers pn] could [adv] have | 425 |
|
| 2 | [pers pn] could [adv] have [noun] | 42 |
|
| 3 | [conj] [pers pn] could have [noun] | 31 |
|
| 4 | [conj] [pers pn] could [adv] [noun] | 18 |
|
