| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [vb infin] [be] [adv] [vb pp] | 374 |
|
| 2 | could [vb infin] [be] [adv] [verb] | 56 |
|
| 3 | could [vb infin] [be] [adv] [vb pp] | 44 |
|
| 4 | could [verb] [be] [adv] [vb pp] | 44 |
|
