| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] did n't we | 18 |
|
| 2 | [vb past] do n't we | 18 |
|
| 3 | [vb past] [vb past] n't we | 18 |
|
| 4 | did [verb] n't we | 9 |
|
