| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | should [be] [adj] [noun] | 501 |
|
| 2 | should [be] [adj] [noun] | 264 |
|
| 3 | [vb mod] [be] compulsory [noun] | 10 |
|
| 4 | [modal v] [be] compulsory [noun] | 10 |
|
| 5 | should [be] compulsory [noun] | 5 |
|
| 6 | should [be] compulsory [noun] | 5 |
|
