| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [det] [prep] [be] | 1633 |
|
| 2 | [det] must [be] | 900 |
|
| 3 | must [prep] [be] | 149 |
|
| 4 | [det] must [prep] | 27 |
|
