| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could not [verb] | 21336 |
|
| 2 | could not [vb infin] | 21316 |
|
| 3 | [modal v] not have | 10570 |
|
| 4 | [vb mod] not have | 10570 |
|
| 5 | could [adv] have | 3255 |
|
| 6 | could not have | 1781 |
|
| 7 | could not have | 1779 |
|
