| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] why they do [not/n't] | 24 |
|
| 2 | [verb] why they do not | 23 |
|
| 3 | [verb] why they do n't | 18 |
|
| 4 | [vb infin] why they do [adv] | 17 |
|
| 5 | know why they do [adv] | 10 |
|
| 6 | know why they do [adv] | 10 |
|
| 7 | [to-vb] why they do [adv] | 7 |
|
| 8 | [verb] why they do not | 5 |
|
