| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | why do [not/n't] they [vb infin] | 75 |
|
| 2 | do [not/n't] they [adv] [vb infin] | 20 |
|
| 3 | why do they [adv] [vb infin] | 17 |
|
| 4 | why do [not/n't] they [adv] | 10 |
|
