| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [vb infin] [vb pp] [adv] | 4523 |
|
| 2 | could [vb infin] [verb] [adv] | 913 |
|
| 3 | could [verb] [vb pp] [adv] | 677 |
|
