| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] could not be | 1289 |
|
| 2 | [det] [pron] could not | 131 |
|
| 3 | [det] could not be | 106 |
|
| 4 | [det] [pron] could be | 55 |
|
