| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they must be [verb] [prep] | 142 |
|
| 2 | they must be [verb] [prep] | 142 |
|
| 3 | they [modal v] be [verb] on | 122 |
|
| 4 | [pron] must be [verb] on | 31 |
|
| 5 | they must be [verb] on | 6 |
|
| 6 | they must [be] [verb] on | 6 |
|
| 7 | they must be [verb] on | 6 |
|
| 8 | they must [be] [verb] on | 6 |
|
