| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] not be reduced | 60 |
|
| 2 | [vb mod] not be reduced | 60 |
|
| 3 | [modal v] not be reduced | 58 |
|
| 4 | can not be reduced | 43 |
|
| 5 | can not be reduced | 41 |
|
| 6 | could not be reduced | 5 |
|
| 7 | could not be reduced | 5 |
|
