| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] if they could [vb infin] [pron] | 9 |
|
| 2 | [vb past] if they could [verb] [pron] | 9 |
|
| 3 | asked if they could [verb] [pron] | 9 |
|
| 4 | [vb past] if they could [verb] [pers pn] | 6 |
|
