| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [verb] [verb] | 7462 |
|
| 2 | [modal v] [verb] [vb infin] | 1126 |
|
| 3 | [vb mod] [verb] [vb infin] | 1126 |
|
| 4 | could [verb] [vb infin] | 120 |
|
