| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] [pron] could [vb infin] | 1068 |
|
| 2 | [Wh det] [indef pn] [modal v] [vb infin] | 372 |
|
| 3 | [pron] [indef pn] could [vb infin] | 79 |
|
| 4 | [Wh det] [indef pn] could [verb] | 48 |
|
