| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | why did n't [pers pn] [vb infin] | 596 |
|
| 2 | why did [pers pn] [vb infin] [prep] | 121 |
|
| 3 | did n't [pers pn] [vb infin] [prep] | 116 |
|
