| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | why do n't they [vb infin] a | 12 |
|
| 2 | [Wh adv] do n't they [vb infin] a | 11 |
|
| 3 | [Wh adv] do n't they [vb infin] a | 8 |
|
