| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] they could [vb infin] it | 13 |
|
| 2 | [verb] they could [verb] it | 13 |
|
| 3 | [verb] they could do it | 10 |
|
| 4 | [verb] they could do it | 10 |
|
| 5 | [vb past] they could [verb] it | 6 |
|
