| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] could [verb] [pron] | 308 |
|
| 2 | [conj] [modal v] [verb] their | 181 |
|
| 3 | [conj] could [verb] [pos pn] | 85 |
|
| 4 | [conj] could [verb] their | 23 |
|
