| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must have [been] [vb pp] [prep] | 237 |
|
| 2 | must have [been] [vb pp] [prep] | 237 |
|
| 3 | [modal v] have [been] [vb pp] from | 127 |
|
| 4 | [vb mod] have [been] [vb pp] from | 127 |
|
| 5 | must have [been] [verb] from | 14 |
|
| 6 | must have [been] [vb pp] from | 11 |
|
| 7 | must have [been] [vb pp] from | 11 |
|
| 8 | must have [been] [vb pp] from | 11 |
|
| 9 | must have [be] [vb pp] from | 11 |
|
| 10 | must [vb infin] [been] [vb pp] from | 11 |
|
| 11 | must [verb] [been] [vb pp] from | 11 |
|
