| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they could not [vb infin] | 628 |
|
| 2 | [vb past] they could [vb infin] | 182 |
|
| 3 | [vb past] they could not | 45 |
|
| 4 | [vb past] they not [vb infin] | 23 |
|
| 5 | [vb past] could not [vb infin] | 14 |
|
