| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | who do n't | 1075 |
|
| 2 | [Wh pn] do n't | 461 |
|
| 3 | [Wh pn] did n't | 372 |
|
| 4 | [Wh pn] does n't | 245 |
|
