| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pers pn] could [not/n't] [vb infin] | 13769 |
|
| 2 | [adv] [pers pn] could [vb infin] | 2775 |
|
| 3 | [adv] could [not/n't] [vb infin] | 955 |
|
| 4 | [adv] [pers pn] could [not/n't] | 711 |
|
