| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be not sure whether | 180 |
|
| 2 | 'm not sure whether | 82 |
|
| 3 | am not sure whether | 34 |
|
| 4 | was not sure whether | 19 |
|
| 5 | are not sure whether | 18 |
|
| 6 | 're not sure whether | 13 |
|
| 7 | is not sure whether | 8 |
|
