| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [ex0] must [be] | 1467 |
|
| 2 | [ex0] [prep] [be] | 217 |
|
| 3 | must [prep] [be] | 149 |
|
| 4 | [ex0] must [prep] | 20 |
|
