| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [not/n't] [verb] [prep] a | 160 |
|
| 2 | we could [not/n't] [verb] [prep] | 84 |
|
| 3 | we could [verb] [prep] a | 65 |
|
| 4 | we could [not/n't] [verb] a | 35 |
|
