| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must have [been] [verb] | 793 |
|
| 2 | must have [been] [vb pp] | 496 |
|
| 3 | [vb mod] have [been] made | 180 |
|
| 4 | [modal v] have [been] made | 180 |
|
| 5 | must have [been] make | 14 |
|
| 6 | must have [be] made | 12 |
|
| 7 | must [verb] [been] made | 12 |
|
| 8 | must have [been] made | 12 |
|
