| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | but could [adv] | 86 |
|
| 2 | but could only | 16 |
|
| 3 | but could never | 11 |
|
| 4 | but could still | 11 |
|
| 5 | but could also | 10 |
|
| 6 | but could well | 5 |
|
