| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it should not be [vb pp] that | 79 |
|
| 2 | it should [not/n't] be forgotten that | 32 |
|
| 3 | it should [not/n't] be assumed that | 24 |
|
| 4 | it should [not/n't] be thought that | 10 |
|
