| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [indef pn] could have [vb pp] us | 5 |
|
| 2 | [indef pn] could have [vb pp] us | 5 |
|
| 3 | [indef pn] could [vb infin] [vb pp] us | 5 |
|
