| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] could [adv] have be [noun prp] | 7 |
|
| 2 | [pron] could [adv] have [been] [noun prp] | 7 |
|
| 3 | [pron] could [adv] have been [noun prp] | 7 |
|
| 4 | [pron] could [adv] have [be] [noun prp] | 7 |
|
