| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must have been [adj] | 760 |
|
| 2 | must have been [det] | 93 |
|
| 3 | [modal v] have been many | 25 |
|
| 4 | [vb mod] have been many | 25 |
|
| 5 | must have [be] many | 20 |
|
| 6 | must [verb] been many | 20 |
|
| 7 | must have been many | 20 |
|
| 8 | must have be many | 20 |
|
| 9 | must have [been] many | 20 |
|
| 10 | must have been many | 20 |
|
