| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [vb infin] [pron] | 12148 |
|
| 2 | [vb infin] [pron] [pers pn] | 8852 |
|
| 3 | could [vb infin] [pers pn] | 7007 |
|
| 4 | could [pron] [pers pn] | 9 |
|
