| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] only be done | 64 |
|
| 2 | [vb mod] only [be] done | 64 |
|
| 3 | can only [be] done | 41 |
|
| 4 | could only [be] done | 14 |
|
