| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must have [verb] a [adj] [noun pl] | 14 |
|
| 2 | must have [vb pp] a [adj] [noun pl] | 14 |
|
| 3 | must have [be] a [adj] [noun pl] | 5 |
|
| 4 | must have been a [adj] [noun pl] | 5 |
|
| 5 | must have be a [adj] [noun pl] | 5 |
|
| 6 | must have [been] a [adj] [noun pl] | 5 |
|
