| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] could [adv] | 9407 |
|
| 2 | [pron] could have | 5696 |
|
| 3 | could [adv] have | 1475 |
|
| 4 | [pron] [adv] have | 429 |
|
