| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | should not be [verb] | 2741 |
|
| 2 | should not be [vb pp] | 2510 |
|
| 3 | [modal v] not be underestimated | 69 |
|
| 4 | should [adv] be underestimated | 60 |
|
| 5 | should not [be] underestimated | 52 |
|
| 6 | should not be underestimate | 52 |
|
