| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [ex0] must have [be] | 17 |
|
| 2 | [adv] [ex0] must have [be] | 17 |
|
| 3 | [adv] [ex0] must have [been] | 17 |
|
| 4 | [adv] [ex0] must have been | 17 |
|
| 5 | [adv] [ex0] must have be | 17 |
|
| 6 | [adv] there must have [be] | 17 |
|
