| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] they could have | 44 |
|
| 2 | [vb base] they could have | 14 |
|
| 3 | think they could have | 13 |
|
| 4 | say they could have | 10 |
|
| 5 | [vb pp] they could have | 8 |
|
| 6 | [vb past] they could have | 8 |
|
| 7 | [vb -s] they could have | 6 |
|
| 8 | think they could have | 5 |
|
| 9 | [vb infin] they could have | 5 |
|
| 10 | said they could have | 5 |
|
