| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could not [vb infin] be | 601 |
|
| 2 | [det] could [vb infin] be | 131 |
|
| 3 | [det] could not be | 106 |
|
| 4 | [det] could not [vb infin] | 83 |
|
