| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] only be explained [prep] | 18 |
|
| 2 | can only be explained [prep] | 14 |
|
| 3 | can only be explained [prep] | 14 |
|
| 4 | [modal v] only be explained by | 7 |
|
| 5 | [modal v] only be explained in | 6 |
|
