| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | should be [vb pp] to be [vb pp] | 18 |
|
| 2 | should be seen to be [verb] | 11 |
|
| 3 | should be [vb pp] to be do | 7 |
|
| 4 | should be [vb pp] to be done | 5 |
|
