| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | but [adv] they could [adv] | 8 |
|
| 2 | but [adv] they could [not/n't] | 7 |
|
| 3 | but [adv] they could not | 7 |
|
| 4 | but [adv] they could [verb] | 5 |
|
| 5 | but [adv] they could [vb infin] | 5 |
|
