| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must not be [adv] | 42 |
|
| 2 | must [not/n't] be too | 19 |
|
| 3 | must n't be [adv] | 13 |
|
| 4 | must [not/n't] be so | 10 |
|
