| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb base] why do n't [pers pn] [vb infin] | 10 |
|
| 2 | [vb base] why do n't [pers pn] [verb] | 8 |
|
| 3 | [vb base] why do n't you [verb] | 7 |
|
