| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | should have [vb pp] [prep] | 556 |
|
| 2 | [modal v] have [vb pp] at | 359 |
|
| 3 | should [verb] [vb pp] at | 49 |
|
| 4 | should [vb infin] [vb pp] at | 49 |
|
| 5 | should have [vb pp] at | 49 |
|
| 6 | should have [verb] at | 48 |
|
