| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] not [adv] [verb] [prep] | 871 |
|
| 2 | could [adv] [adv] [verb] [prep] | 322 |
|
| 3 | could not [adv] [verb] [prep] | 174 |
|
| 4 | could not [adv] [verb] [prep] | 174 |
|
