| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | why [vb -s] not [pers pn] [vb infin] | 86 |
|
| 2 | [vb -s] not [pers pn] [vb infin] [prep] | 35 |
|
| 3 | why [vb -s] [pers pn] [vb infin] [prep] | 28 |
|
