| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] but could | 61 |
|
| 2 | [v-ing] [conj] could | 33 |
|
| 3 | [v-ing] but [vb mod] | 18 |
|
| 4 | [v-ing] but [modal v] | 18 |
|
| 5 | [v-ing] but could | 5 |
|
