| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] be [vb pp] [prep] | 52272 |
|
| 2 | must be [vb pp] [prep] | 4921 |
|
| 3 | must [verb] [vb pp] [prep] | 719 |
|
| 4 | must [verb] be [vb pp] | 502 |
|
| 5 | must [verb] be [prep] | 297 |
|
