| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] only [be] used | 186 |
|
| 2 | must [adv] [be] used | 49 |
|
| 3 | must only [be] [verb] | 15 |
|
| 4 | must only [be] [vb pp] | 15 |
|
| 5 | must only [be] use | 7 |
|
| 6 | must only [be] used | 7 |
|
