| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [vb infin] i [vb infin] | 350 |
|
| 2 | could [vb infin] [pron] [vb infin] | 206 |
|
| 3 | could [vb infin] i [verb] | 119 |
|
| 4 | could [verb] i [vb infin] | 63 |
|
