| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | should [vb infin] [been] [vb pp] | 751 |
|
| 2 | [coord] should [vb infin] [vb pp] | 65 |
|
| 3 | [coord] should [vb infin] [been] | 42 |
|
