| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could n't [vb infin] [vb pp] [pers pn] [vb infin] | 5 |
|
| 2 | could [not/n't] [vb infin] [vb pp] [pers pn] [vb infin] | 5 |
|
| 3 | could [not/n't] have [vb pp] [pers pn] [vb infin] | 5 |
|
