| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [pron] could not | 287 |
|
| 2 | why [pron] [vb mod] not | 238 |
|
| 3 | why [pron] [modal v] not | 238 |
|
| 4 | why [pron] could [adv] | 111 |
|
| 5 | why [pron] could [not/n't] | 104 |
|
| 6 | why [pron] could not | 104 |
|
| 7 | [Wh adv] [pron] could not | 70 |
|
| 8 | why [pron] could not | 33 |
|
| 9 | why [pron] could not | 33 |
|
