| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | should be [vb pp] [to-vb] a [noun sg] | 48 |
|
| 2 | should [be] [vb pp] [to-vb] a [noun sg] | 48 |
|
| 3 | should [be] required [to-vb] a [noun sg] | 8 |
|
| 4 | should [be] asked [to-vb] a [noun sg] | 5 |
|
