| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [be] [vb pp] [that] | 8671 |
|
| 2 | it must [be] [vb pp] | 1391 |
|
| 3 | must [be] [vb pp] [that] | 626 |
|
| 4 | it must [be] [that] | 6 |
|
