| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | why [vb past] n't they [vb infin] | 43 |
|
| 2 | [vb past] n't they [adv] [vb infin] | 15 |
|
| 3 | why [vb past] they [adv] [vb infin] | 10 |
|
| 4 | why [vb past] n't they [adv] | 8 |
|
