| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [vb infin] [prep] [adv] a [noun] | 74 |
|
| 2 | could [vb infin] [prep] [adv] [art] [noun] | 16 |
|
| 3 | could [verb] [prep] [adv] a [noun] | 9 |
|
