| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must have been [art] [adj] | 289 |
|
| 2 | [noun sg] must have been [adj] | 120 |
|
| 3 | [noun sg] must have [art] [adj] | 84 |
|
| 4 | [noun sg] must have been [art] | 75 |
|
| 5 | [noun sg] have been [art] [adj] | 5 |
|
