| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [vb infin] [verb] | 7453 |
|
| 2 | [vb infin] [verb] [modal v] | 122 |
|
| 3 | could [verb] [modal v] | 79 |
|
| 4 | could [vb infin] [modal v] | 79 |
|
