| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] be required to [be] [verb] | 14 |
|
| 2 | [modal v] be required to be [verb] | 14 |
|
| 3 | [modal v] be required to [be] [vb pp] | 14 |
|
| 4 | [modal v] be required to be [verb] | 14 |
|
| 5 | [modal v] be required to [be] [verb] | 14 |
|
