| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | why could not [pers pn] [adv] [verb] | 13 |
|
| 2 | why could [not/n't] [pers pn] [adv] [verb] | 13 |
|
| 3 | why could n't [pers pn] [adv] [verb] | 13 |
|
| 4 | why could [adv] [pers pn] [adv] [verb] | 13 |
|
