| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [verb] [pron] could have | 42 |
|
| 2 | [verb] [verb] [pers pn] could have | 39 |
|
| 3 | [verb] [verb] they [modal v] have | 39 |
|
| 4 | [verb] [verb] they [vb mod] have | 39 |
|
| 5 | [verb] [verb] they could [vb infin] | 21 |
|
| 6 | [verb] [verb] they could [verb] | 21 |
|
| 7 | [verb] [verb] they could have | 9 |
|
| 8 | [verb] [verb] they could have | 7 |
|
| 9 | [verb] [verb] they could have | 7 |
|
