| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | why [pron] should [vb infin] | 412 |
|
| 2 | [adv] he should [vb infin] | 211 |
|
| 3 | why he [modal v] [vb infin] | 96 |
|
| 4 | why he should [verb] | 59 |
|
