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