| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] could [not/n't] | 17946 |
|
| 2 | why could [not/n't] | 182 |
|
| 3 | why [pron] could | 123 |
|
| 4 | why [pron] [not/n't] | 5 |
|
