| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have not been found | 53 |
|
| 2 | have not be found | 46 |
|
| 3 | has not be found | 21 |
|
| 4 | have not be found | 20 |
|
| 5 | had not be found | 11 |
|
| 6 | have n't be found | 7 |
|
