| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] [vb past] [subord] [pron] | 831 |
|
| 2 | [conj] [subord] [pron] could | 789 |
|
| 3 | [vb past] [subord] [pron] could | 402 |
|
| 4 | [conj] [vb past] [pron] could | 162 |
|
