| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must have been make | 14 |
|
| 2 | must [vb infin] been make | 14 |
|
| 3 | must [verb] been make | 14 |
|
| 4 | must have been make | 14 |
|
| 5 | must [verb] been made | 12 |
|
