| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | why did [adv] i think | 16 |
|
| 2 | why [vb past] [not/n't] i think | 16 |
|
| 3 | why [vb past] not i think | 16 |
|
| 4 | why [vb past] n't i think | 15 |
|
