| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [not/n't] [vb infin] | 21338 |
|
| 2 | [not/n't] we [vb infin] | 544 |
|
| 3 | could we [vb infin] | 356 |
|
| 4 | could [not/n't] we | 134 |
|
