| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh adv] [pron] could not [vb infin] [noun] | 10 |
|
| 2 | [Wh adv] [pers pn] could not [vb infin] [noun] | 10 |
|
| 3 | [Wh adv] [pron] could n't [vb infin] [noun] | 7 |
|
| 4 | why [pron] could not [vb infin] [noun] | 5 |
|
