| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [vb infin] [been] [adv] [vb pp] | 343 |
|
| 2 | could [vb infin] [been] [adv] [verb] | 44 |
|
| 3 | could [vb infin] [be] [adv] [vb pp] | 44 |
|
| 4 | could [verb] [been] [adv] [vb pp] | 38 |
|
| 5 | could [vb infin] [been] [adv] [vb pp] | 38 |
|
