| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] and [modal v] [verb] | 160 |
|
| 2 | could [conj] [modal v] [verb] | 69 |
|
| 3 | could [coord] [modal v] [verb] | 69 |
|
| 4 | could and [modal v] [verb] | 50 |
|
