| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] could [vb infin] [verb] to [pron] | 7 |
|
| 2 | [Wh det] could have [verb] [prep] [pron] | 7 |
|
| 3 | [Wh det] could [vb infin] [verb] [prep] [pron] | 7 |
|
| 4 | [Wh det] could [vb infin] [verb] [prep] [pron] | 7 |
|
| 5 | [Wh det] could [vb infin] [vb pp] [prep] [pron] | 7 |
|
| 6 | [Wh det] could [vb infin] [verb] to [pron] | 7 |
|
| 7 | [Wh det] could [vb infin] [verb] [prep] [pers pn] | 5 |
|
