| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] not [verb] [adj] | 4238 |
|
| 2 | could [adv] [verb] [adj] | 2531 |
|
| 3 | could [not/n't] [verb] [adj] | 1555 |
|
| 4 | could not [verb] [adj] | 1554 |
|
