| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [coord] [vb past] [conj] [pron] could | 155 |
|
| 2 | [coord] [vb past] [subord] [pron] [modal v] | 150 |
|
| 3 | [coord] [verb] [subord] [pron] could | 147 |
|
| 4 | [conj] [vb past] [subord] [pron] could | 74 |
|
