| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must be [vb pp] [prep] | 4919 |
|
| 2 | [noun sg] must be [vb pp] | 4161 |
|
| 3 | [noun sg] be [vb pp] [prep] | 1198 |
|
| 4 | [noun sg] must be [prep] | 327 |
|
