| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [modal v] [be] required to be | 13 |
|
| 2 | [noun sg] [modal v] [be] required to be | 8 |
|
| 3 | [modal v] [be] required to be [vb pp] | 14 |
|
| 4 | [modal v] [be] required to be [verb] | 14 |
|
