| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it must not be [vb pp] that | 29 |
|
| 2 | it must not [be] forgotten that | 12 |
|
| 3 | it must not [be] assumed that | 8 |
|
| 4 | it must not [be] thought that | 6 |
|
