| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [vb infin] [prep] a [noun] | 663 |
|
| 2 | [Wh det] could [vb infin] [prep] [noun] | 62 |
|
| 3 | [Wh det] could [vb infin] a [noun] | 61 |
|
| 4 | [Wh det] could [vb infin] [prep] a | 42 |
|
