| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which [modal v] only [be] understood | 6 |
|
| 2 | which [vb mod] only [be] understood | 6 |
|
| 3 | which [modal v] only [be] understood | 6 |
|
| 4 | which [modal v] only be understood | 6 |
|
| 5 | which can only [be] understood | 5 |
|
| 6 | which can only [be] understood | 5 |
|
