| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | but [pers pn] must have be | 57 |
|
| 2 | but [pers pn] must have been | 57 |
|
| 3 | but it must have be | 30 |
|
| 4 | but he must have be | 12 |
|
