| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [prep] [noun prp] [noun] | 272 |
|
| 2 | must be [prep] [noun] | 239 |
|
| 3 | must be [noun prp] [noun] | 70 |
|
| 4 | must be [prep] [noun prp] | 41 |
|
