| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [adv] have [be] | 471 |
|
| 2 | [adv] have [be] [noun] | 117 |
|
| 3 | could [adv] [be] [noun] | 105 |
|
| 4 | could have [be] [noun] | 94 |
|
| 5 | could [adv] have [noun] | 22 |
|
