| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | reason [Wh adv] they do not | 8 |
|
| 2 | reason why they do not | 8 |
|
| 3 | reason why they do not | 8 |
|
| 4 | reason [adv] they do not | 8 |
|
| 5 | reason they do not [vb infin] | 6 |
|
| 6 | reason they do not [verb] | 6 |
|
