| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [adv] | 46692 |
|
| 2 | could [adv] | 17491 |
|
| 3 | [vb mod] then | 4733 |
|
| 4 | [modal v] then | 4733 |
|
| 5 | could then | 438 |
|
| 6 | could then | 438 |
|
