| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [verb] [coord] then | 9 |
|
| 2 | could [vb infin] [conj] then | 9 |
|
| 3 | could [verb] and then | 6 |
|
| 4 | could [verb] and then | 6 |
|
