| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could not have [vb pp] [pron] | 219 |
|
| 2 | could not have [verb] [pron] | 219 |
|
| 3 | [modal v] not have left [pron] | 23 |
|
| 4 | could [adv] have left [pron] | 7 |
|
| 5 | could not [verb] left [pron] | 5 |
|
| 6 | could not [vb infin] left [pron] | 5 |
|
| 7 | could not have left [pron] | 5 |
|
| 8 | could not have leave [pron] | 5 |
|
