| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [pron] could have | 529 |
|
| 2 | [vb pp] [pron] [modal v] have | 394 |
|
| 3 | [vb pp] [pron] could [vb infin] | 229 |
|
| 4 | [vb pp] [pron] could [verb] | 229 |
|
| 5 | [vb pp] [pron] could have | 45 |
|
