| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] be compulsory [noun] | 10 |
|
| 2 | [vb mod] be compulsory [noun] | 10 |
|
| 3 | [modal v] be compulsory [noun sg] | 9 |
|
| 4 | should be compulsory [noun] | 5 |
|
| 5 | will be compulsory [noun] | 5 |
|
| 6 | should be compulsory [noun] | 5 |
|
| 7 | will be compulsory [noun] | 5 |
|
