| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [not/n't] know why they do [adv] | 10 |
|
| 2 | [adv] know why they do [adv] | 10 |
|
| 3 | n't know why they do [adv] | 9 |
|
| 4 | not know why they do [adv] | 9 |
|
| 5 | know why they do [adv] [vb infin] | 7 |
|
| 6 | know why they do [adv] [verb] | 7 |
|
