| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | should be [vb pp] [adv] | 2604 |
|
| 2 | [vb mod] be [vb pp] only | 754 |
|
| 3 | [modal v] be [vb pp] only | 754 |
|
| 4 | should be [verb] only | 96 |
|
| 5 | should [be] [vb pp] only | 96 |
|
| 6 | should be [vb pp] only | 96 |
|
