| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it must have [be] a [adj] | 71 |
|
| 2 | it must have been a [adj] | 71 |
|
| 3 | it must have [been] a [adj] | 71 |
|
| 4 | it must have be a [adj] | 71 |
|
| 5 | it must have [verb] a [adj] | 15 |
|
| 6 | it must have [vb pp] a [adj] | 15 |
|
| 7 | it must have taken a [adj] | 5 |
|
| 8 | it must have take a [adj] | 5 |
|
| 9 | it must have a [adj] [noun sg] | 5 |
|
| 10 | it must have a [adj] [noun] | 5 |
|
