| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] [vb infin] [adv] and [verb] | 1900 |
|
| 2 | [modal v] [vb infin] [adv] and [verb] | 1900 |
|
| 3 | could [vb infin] [adv] [conj] [verb] | 269 |
|
| 4 | could [verb] [adv] and [verb] | 227 |
|
| 5 | could [vb infin] [adv] and [verb] | 227 |
|
