| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [pers pn] [adv] [vb infin] | 576 |
|
| 2 | could [adv] [vb infin] [conj] | 544 |
|
| 3 | [pers pn] [adv] [vb infin] [conj] | 445 |
|
| 4 | could [pers pn] [vb infin] [conj] | 152 |
|
