| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] must [verb] been [adj] | 446 |
|
| 2 | [Wh det] [vb mod] [verb] been [adj] | 169 |
|
| 3 | [Wh det] [modal v] [verb] been [adj] | 169 |
|
| 4 | [Wh det] must [verb] [be] [adj] | 27 |
|
| 5 | [Wh det] must [verb] be [adj] | 27 |
|
| 6 | [Wh det] must [verb] been [adj] | 27 |
|
| 7 | [Wh det] must [verb] [been] [adj] | 27 |
|
