| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] not be left to | 25 |
|
| 2 | should [not/n't] be left to | 9 |
|
| 3 | can [not/n't] be left to | 7 |
|
| 4 | must [not/n't] be left to | 5 |
|
