| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [vb infin] on [prep] a [noun] | 6 |
|
| 2 | could [vb infin] on [prep] a [noun sg] | 6 |
|
| 3 | could [vb infin] on [prep] a [noun] | 6 |
|
