| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what have [not/n't] been | 22 |
|
| 2 | what have not been | 20 |
|
| 3 | what has [not/n't] been | 14 |
|
| 4 | what had [not/n't] been | 6 |
|
