| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | should be required [verb] a [noun] | 9 |
|
| 2 | should be require [verb] a [noun] | 9 |
|
| 3 | should be require [verb] a [noun] | 9 |
|
| 4 | should be require [to-vb] a [noun] | 9 |
|
| 5 | should be require [verb] a [noun sg] | 8 |
|
