| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | they [vb mod] only be used | 11 |
|
| 2 | they [vb mod] only [be] used | 11 |
|
| 3 | they [vb mod] only [be] used | 11 |
|
| 4 | they can only [be] used | 5 |
|
