| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun pl] must be [vb pp] [prep] | 999 |
|
| 2 | must [not/n't] be [vb pp] [prep] | 184 |
|
| 3 | [noun pl] must [not/n't] be [vb pp] | 72 |
|
