| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what have been [vb pp] for | 20 |
|
| 2 | what have [been] [vb pp] for | 20 |
|
| 3 | what has [been] [vb pp] for | 12 |
|
| 4 | what had [been] [vb pp] for | 7 |
|
| 5 | what have [been] done for | 5 |
|
