| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] [det] could be | 344 |
|
| 2 | [conj] could n't be | 56 |
|
| 3 | [det] could n't be | 27 |
|
| 4 | [conj] [det] could n't | 11 |
|
