| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it must be [verb] that | 586 |
|
| 2 | it must [adv] be [verb] | 219 |
|
| 3 | must [adv] be [verb] that | 107 |
|
| 4 | it [adv] be [verb] that | 21 |
|
