| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | should [be] [vb pp] [prep] be [art] | 9 |
|
| 2 | should be [vb pp] [prep] be [art] | 9 |
|
| 3 | should [be] [vb pp] to be [art] | 9 |
|
| 4 | should [be] [vb pp] [prep] be a | 6 |
|
