| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be required [verb] a [noun] | 156 |
|
| 2 | should be [verb] a [noun] | 99 |
|
| 3 | should be required [verb] a | 10 |
|
| 4 | should be required [verb] [noun] | 5 |
|
