| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | why did n't [pers pn] [vb infin] it | 32 |
|
| 2 | why did [not/n't] you [vb infin] it | 19 |
|
| 3 | why did [not/n't] they [vb infin] it | 6 |
|
| 4 | why did [not/n't] [pers pn] do it | 5 |
|
