| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [adv] have [be] [noun] | 93 |
|
| 2 | could [adv] have [be] [noun] | 31 |
|
| 3 | could [adv] [verb] [be] [noun] | 25 |
|
| 4 | could [adv] [vb infin] [be] [noun] | 25 |
|
| 5 | could [adv] have [be] [noun] | 23 |
|
