| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] could [adv] have | 503 |
|
| 2 | [noun] [conj] could [adv] | 444 |
|
| 3 | [noun] [conj] could have | 228 |
|
| 4 | [conj] could [adv] have | 90 |
|
