| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] only be achieved | 94 |
|
| 2 | [modal v] only be achieved | 94 |
|
| 3 | can only be achieved | 64 |
|
| 4 | can only be achieved | 64 |
|
| 5 | could only be achieved | 25 |
|
| 6 | could only be achieved | 25 |
|
