| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [vb infin] [conj] [art] | 5027 |
|
| 2 | could [verb] [conj] [art] | 446 |
|
| 3 | could [vb infin] [conj] [art] | 443 |
|
