| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [Wh adv] they could [adv] [vb infin] | 15 |
|
| 2 | [verb] [adv] they could not [vb infin] | 14 |
|
| 3 | [verb] [adv] they could [not/n't] [vb infin] | 14 |
|
| 4 | [verb] [adv] they could n't [vb infin] | 9 |
|
| 5 | [verb] why they could [adv] [vb infin] | 8 |
|
| 6 | [verb] why they could [adv] [vb infin] | 8 |
|
| 7 | [vb past] [adv] they could [adv] [vb infin] | 7 |
|
| 8 | [verb] how they could [adv] [vb infin] | 5 |
|
| 9 | [to-vb] [adv] they could [adv] [vb infin] | 5 |
|
| 10 | [verb] how they could [adv] [vb infin] | 5 |
|
| 11 | [verb] [adv] they could not [vb infin] | 5 |
|
