| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it must [be] [vb pp] that | 586 |
|
| 2 | it must [adv] [be] [vb pp] | 142 |
|
| 3 | must [adv] [be] [vb pp] that | 77 |
|
| 4 | it [adv] [be] [vb pp] that | 11 |
|
