| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | n't know [adv] | 3837 |
|
| 2 | n't [verb] why | 1647 |
|
| 3 | [adv] know why | 1027 |
|
| 4 | [not/n't] know why | 932 |
|
| 5 | not know why | 930 |
|
