| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what [be] required [prep] | 97 |
|
| 2 | what [be] required [prep] | 97 |
|
| 3 | what [be] [verb] for | 77 |
|
| 4 | what [be] [vb pp] for | 63 |
|
| 5 | [pron] [be] required for | 45 |
|
| 6 | what [be] require for | 13 |
|
| 7 | what [be] required for | 13 |
|
