| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] [prep] [det] [noun] [pron] could | 6 |
|
| 2 | [vb past] [prep] [det] [pron] could [verb] | 5 |
|
| 3 | [vb past] [prep] [det] [pron] could [vb infin] | 5 |
|
