| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] could [vb infin] [pron] | 308 |
|
| 2 | [conj] [vb infin] [subord] [pron] | 285 |
|
| 3 | could [vb infin] [subord] [pron] | 243 |
|
| 4 | [conj] could [vb infin] [subord] | 15 |
|
