| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] [vb infin] [verb] a [noun] [adv] | 201 |
|
| 2 | could [vb infin] [verb] [art] [noun] [adv] | 73 |
|
| 3 | could [verb] [verb] a [noun] [adv] | 19 |
|
