| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [adv] have [been] [adj] | 32 |
|
| 2 | could [adv] have be [adj] | 32 |
|
| 3 | could [adv] have been [adj] | 32 |
|
| 4 | could well have [be] [adj] | 10 |
|
