| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could have [vb pp] [adv prt] a [noun] | 9 |
|
| 2 | could [vb infin] [vb pp] [adv prt] a [noun sg] | 9 |
|
| 3 | could [vb infin] [vb pp] up a [noun] | 5 |
|
