| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [verb] [art] | 12345 |
|
| 2 | [vb mod] have [art] | 12042 |
|
| 3 | [modal v] have [art] | 12042 |
|
| 4 | could have [art] | 762 |
|
| 5 | could have [art] | 762 |
|
