| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must have [been] as | 10 |
|
| 2 | must have been as | 10 |
|
| 3 | must have be as | 10 |
|
| 4 | must have [be] as | 10 |
|
| 5 | must have [verb] as | 7 |
|
| 6 | must have [vb pp] as | 7 |
|
| 7 | must have as [det] | 5 |
|
| 8 | must have as [adj] | 5 |
|
