| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [noun prp] could [vb infin] | 240 |
|
| 2 | [prep] [Wh det] could [vb infin] | 96 |
|
| 3 | [prep] [noun prp] [Wh det] could | 23 |
|
| 4 | [noun prp] [Wh det] could [vb infin] | 23 |
|
