| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could as [adv] [verb] | 6 |
|
| 2 | could as well [verb] | 6 |
|
| 3 | could as well [verb] | 6 |
|
| 4 | could as [adv] [vb infin] | 6 |
|
