| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [vb infin] [conj] [verb] [art] | 1097 |
|
| 2 | could [verb] [conj] [verb] [art] | 112 |
|
| 3 | could [vb infin] [conj] [verb] [art] | 110 |
|
