| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | this could have be a [adj] | 5 |
|
| 2 | this could have been a [adj] | 5 |
|
| 3 | this could have [be] a [adj] | 5 |
|
| 4 | this could have [been] a [adj] | 5 |
|
| 5 | this could have [be] a [adj] | 5 |
|
| 6 | this could have [be] a [adj] | 5 |
|
