| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | know why they do [not/n't] | 12 |
|
| 2 | know why they do [adv] | 11 |
|
| 3 | know why they do n't | 11 |
|
| 4 | know why they do not | 11 |
|
| 5 | know why they do [adv] | 10 |
|
