| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they could [adv] [vb infin] [art] | 292 |
|
| 2 | [vb past] they could [adv] [vb infin] | 99 |
|
| 3 | [vb past] they could [vb infin] [art] | 30 |
|
| 4 | [vb past] they [adv] [vb infin] [art] | 14 |
|
