| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | he should have [be] at | 5 |
|
| 2 | he should [vb infin] been at | 5 |
|
| 3 | he should [vb infin] be at | 5 |
|
| 4 | he should [vb infin] [been] at | 5 |
|
| 5 | he should [vb infin] [be] at | 5 |
|
