| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [prep] [art] | 9356 |
|
| 2 | must [be] [art] | 2268 |
|
| 3 | must [be] [prep] | 1101 |
|
| 4 | must [prep] [art] | 88 |
|
