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