| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [verb] on a | 4098 |
|
| 2 | must [be] [verb] on | 278 |
|
| 3 | must [be] [verb] a | 98 |
|
| 4 | must [verb] on a | 27 |
|
| 5 | must [be] on a | 17 |
|
