| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] and [vb mod] [vb infin] been [verb] | 6 |
|
| 2 | [vb mod] and [vb mod] [verb] been [verb] | 6 |
|
| 3 | [modal v] and [vb mod] have been [verb] | 6 |
|
| 4 | [modal v] and [vb mod] have been [verb] | 6 |
|
| 5 | [modal v] and [vb mod] [verb] been [vb pp] | 5 |
|
| 6 | could and [vb mod] [verb] been [verb] | 5 |
|
| 7 | could and [vb mod] [verb] been [verb] | 5 |
|
| 8 | [modal v] and should [verb] been [verb] | 5 |
|
