| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must have be [verb] [adj] | 12 |
|
| 2 | must have [been] [verb] [adj] | 12 |
|
| 3 | must have [be] [verb] [adj] | 12 |
|
| 4 | must have been [verb] [adj] | 12 |
|
| 5 | must have [be] [v-ing] [adj] | 7 |
|
