| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [not/n't] [be] left | 15 |
|
| 2 | must [not/n't] be left | 15 |
|
| 3 | must [not/n't] be left | 15 |
|
| 4 | must [not/n't] [be] left | 15 |
|
| 5 | must not [be] left | 14 |
|
