| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be not required to [be] | 6 |
|
| 2 | [be] not required to [be] | 6 |
|
| 3 | not required to [be] [vb pp] | 5 |
|
| 4 | not required to [be] [verb] | 5 |
|
