| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it should [not/n't] be forgotten that | 32 |
|
| 2 | it should not be forgotten that | 32 |
|
| 3 | it should not be forgotten that | 32 |
|
| 4 | it should never be forgotten that | 6 |
|
| 5 | it should never be forgotten that | 6 |
|
| 6 | it should [adv] be forgotten that | 6 |
|
