| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] why they do [not/n't] | 39 |
|
| 2 | [verb] why they do not | 38 |
|
| 3 | [verb] why they do n't | 28 |
|
| 4 | [verb] why they do [adv] | 26 |
|
| 5 | [vb infin] why they do [adv] | 21 |
|
| 6 | [verb] why they did [adv] | 15 |
|
| 7 | know why they do [adv] | 12 |
|
| 8 | know why they do [adv] | 11 |
|
| 9 | [verb] why they do not | 10 |
|
| 10 | wonder why they do [adv] | 10 |
|
| 11 | [to-vb] why they do [adv] | 8 |
|
| 12 | [vb past] why they do [adv] | 6 |
|
| 13 | understand why they do [adv] | 5 |
|
