| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must already have [be] [vb pp] | 8 |
|
| 2 | must already have [be] [vb pp] | 8 |
|
| 3 | must already have been [vb pp] | 8 |
|
| 4 | must already have [been] [vb pp] | 8 |
|
| 5 | must already have be [vb pp] | 8 |
|
