| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [adv] [verb] | 32838 |
|
| 2 | could [adv] [vb infin] | 32770 |
|
| 3 | [adv] [verb] [vb infin] | 2723 |
|
| 4 | could [verb] [vb infin] | 120 |
|
