| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] [vb infin] | 653579 |
|
| 2 | [modal v] [vb infin] | 653579 |
|
| 3 | could [verb] | 72140 |
|
| 4 | could [vb infin] | 71860 |
|
