| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb infin] why they do [not/n't] | 21 |
|
| 2 | [vb infin] why they do not | 20 |
|
| 3 | [vb infin] why they do n't | 17 |
|
| 4 | [vb infin] why they do [adv] | 17 |
|
| 5 | know why they do [adv] | 11 |
|
