| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | should be [vb pp] [prep] | 9543 |
|
| 2 | and should be [vb pp] | 602 |
|
| 3 | and be [vb pp] [prep] | 494 |
|
| 4 | and should be [prep] | 20 |
|
