| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what could happen [subord] [pron] | 7 |
|
| 2 | what could [vb infin] [subord] [pron] | 7 |
|
| 3 | what could [vb infin] [subord] [pers pn] | 6 |
|
| 4 | what could [vb infin] if [pron] | 5 |
|
