| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] why do n't they [vb infin] | 8 |
|
| 2 | [coord] why [verb] n't they [vb infin] | 7 |
|
| 3 | [conj] why [vb past] n't they [vb infin] | 6 |
|
| 4 | [conj] why did n't they [vb infin] | 6 |
|
