| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun prp] must [vb infin] [been] [adj] | 30 |
|
| 2 | [noun prp] must [vb infin] been [adj] | 30 |
|
| 3 | [noun prp] must have [be] [adj] | 30 |
|
| 4 | [noun prp] must [vb infin] be [adj] | 30 |
|
