| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | reason why [art] | 481 |
|
| 2 | reason [Wh adv] the | 377 |
|
| 3 | reason [Wh adv] a | 83 |
|
| 4 | reason [Wh adv] an | 14 |
|
| 5 | reason [Wh adv] no | 6 |
|
