| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | i [vb past] [adv] know why | 14 |
|
| 2 | i [vb past] [not/n't] know why | 14 |
|
| 3 | i [vb past] not know why | 14 |
|
| 4 | i [vb past] n't know why | 14 |
|
| 5 | i [vb past] know why [pron] | 5 |
|
