| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | do n't they [vb infin] | 317 |
|
| 2 | why do they [vb infin] | 264 |
|
| 3 | why do n't they | 143 |
|
| 4 | why do n't [vb infin] | 19 |
|
