| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [pron] have [vb pp] [det] [noun sg] | 7 |
|
| 2 | could [pron] [vb infin] [vb pp] [det] [noun sg] | 7 |
|
| 3 | could [pron] have [vb pp] [det] [noun sg] | 7 |
|
| 4 | could [pers pn] [verb] [vb pp] [det] [noun sg] | 7 |
|
