| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [adv] [vb infin] [conj] | 544 |
|
| 2 | could [adv] [vb infin] [be] | 501 |
|
| 3 | [adv] [vb infin] [be] [conj] | 61 |
|
| 4 | could [adv] [be] [conj] | 59 |
|
| 5 | could [vb infin] [be] [conj] | 42 |
|
