| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] must have be | 32 |
|
| 2 | [adv] must have [been] | 32 |
|
| 3 | [adv] must have been | 32 |
|
| 4 | [adv] must have [be] | 32 |
|
| 5 | too must have [be] | 5 |
|
| 6 | too must have [be] | 5 |
|
