| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [not/n't] [vb infin] be for | 6 |
|
| 2 | [vb mod] [not/n't] [vb infin] been for | 6 |
|
| 3 | [vb mod] [not/n't] have be for | 6 |
|
