| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [det] [noun] [prep] | 11522 |
|
| 2 | must be [det] [noun] | 211 |
|
| 3 | must be [noun] [prep] | 174 |
|
| 4 | must be [det] [prep] | 55 |
|
