| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun sg] must [verb] been [prep] | 46 |
|
| 2 | [noun sg] must have been [prep] | 46 |
|
| 3 | [noun sg] must [vb infin] been [prep] | 46 |
|
| 4 | [noun sg] must have been [prep] | 46 |
|
| 5 | [noun sg] must [verb] been in | 15 |
|
| 6 | [noun sg] must [verb] been at | 9 |
|
