| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | should [vb infin] [been] [vb pp] | 751 |
|
| 2 | it should [vb infin] [been] | 230 |
|
| 3 | it should [vb infin] [vb pp] | 130 |
|
| 4 | it [vb infin] [been] [vb pp] | 13 |
|
