| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] [be] required for [adj] | 9 |
|
| 2 | [modal v] [be] required for [adj] | 9 |
|
| 3 | may [be] required for [adj] | 6 |
|
| 4 | may [be] required for [adj] | 6 |
|
| 5 | [be] required for [art] [adj] | 9 |
|
| 6 | [be] required for [art] [adj] | 9 |
|
| 7 | [be] required for a [adj] | 5 |
|
| 8 | [be] required for [adj] [noun] | 11 |
|
| 9 | [be] required for [adj] [noun sg] | 9 |
|
