| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] [pers pn] could | 1827 |
|
| 2 | [vb pp] [Wh det] [pers pn] | 1019 |
|
| 3 | [vb pp] [pers pn] could | 355 |
|
| 4 | [vb pp] [Wh det] could | 59 |
|
