| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | why [vb past] [not/n't] he | 108 |
|
| 2 | why [vb past] n't he | 108 |
|
| 3 | why did [not/n't] he | 83 |
|
| 4 | why had [not/n't] he | 26 |
|
