| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] have [be] | 7626 |
|
| 2 | could [adv] [be] | 7505 |
|
| 3 | could [adv] have | 3257 |
|
| 4 | could have [be] | 2545 |
|
