| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it should be [verb] at [art] | 19 |
|
| 2 | it should be [verb] at [art] | 19 |
|
| 3 | it should be [vb pp] at [art] | 17 |
|
| 4 | it should be [verb] at the | 15 |
|
