| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have not been changed | 21 |
|
| 2 | have not be changed | 15 |
|
| 3 | had not be changed | 9 |
|
| 4 | have not be changed | 7 |
|
| 5 | have n't be changed | 6 |
|
| 6 | has not be changed | 5 |
|
