| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | why did they [adv] [vb infin] | 10 |
|
| 2 | why [vb past] they [adv] [vb infin] | 10 |
|
| 3 | why [vb past] they not [vb infin] | 8 |
|
| 4 | why [vb past] they [not/n't] [vb infin] | 8 |
|
| 5 | why [vb past] they not [vb infin] | 8 |
|
