| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [art] reason why they do [adv] | 6 |
|
| 2 | [art] reason why they do [adv] | 6 |
|
| 3 | the reason why they do [adv] | 5 |
|
| 4 | the reason why they do [adv] | 5 |
|
| 5 | reason why they do [adv] [vb infin] | 5 |
|
| 6 | reason why they do [adv] [verb] | 5 |
|
