| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [verb] [been] [verb] a | 139 |
|
| 2 | [vb mod] [verb] [been] [verb] a | 139 |
|
| 3 | should [verb] [been] [verb] [art] | 38 |
|
| 4 | should [verb] [be] [verb] a | 30 |
|
| 5 | should [verb] [been] [verb] a | 27 |
|
