| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [pron] [adv] | 906 |
|
| 2 | could [pers pn] [adv] | 851 |
|
| 3 | [modal v] he [adv] | 410 |
|
| 4 | could he [adv] | 80 |
|
