| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [pers pn] [vb infin] [pron] | 1004 |
|
| 2 | [pers pn] [vb infin] [pron] [vb infin] | 403 |
|
| 3 | could [vb infin] [pron] [vb infin] | 206 |
|
