| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] could not [verb] | 14307 |
|
| 2 | but [pron] could not | 1373 |
|
| 3 | but [pron] could [verb] | 883 |
|
| 4 | but could not [verb] | 315 |
|
| 5 | but [pron] not [verb] | 16 |
|
