| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [not/n't] [verb] [prep] | 2122 |
|
| 2 | could [not/n't] [verb] [prep] | 2121 |
|
| 3 | [modal v] [not/n't] [verb] of | 815 |
|
| 4 | could [adv] [verb] of | 236 |
|
| 5 | could [not/n't] [verb] of | 171 |
|
