| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] could [vb infin] [conj] [pers pn] [verb] | 7 |
|
| 2 | [Wh det] could [vb infin] [conj] [pers pn] [vb past] | 7 |
|
| 3 | what could [vb infin] [conj] [pers pn] [verb] | 5 |
|
| 4 | [Wh det] could happen [conj] [pers pn] [verb] | 5 |
|
| 5 | [Wh det] could [vb infin] [subord] [pers pn] [verb] | 5 |
|
