| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | should be [vb pp] to [art] | 777 |
|
| 2 | be [vb pp] to [be] [art] | 205 |
|
| 3 | should be [vb pp] to [be] | 73 |
|
| 4 | should be [vb pp] [be] [art] | 12 |
|
