| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [vb infin] [conj] [verb] | 6532 |
|
| 2 | [vb mod] [vb infin] [conj] [verb] | 6532 |
|
| 3 | could [verb] [conj] [verb] | 726 |
|
| 4 | could [vb infin] [conj] [verb] | 717 |
|
