| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] not sure whether | 180 |
|
| 2 | be not sure whether | 180 |
|
| 3 | [am/are] not sure whether | 147 |
|
| 4 | 'm not sure whether | 82 |
|
| 5 | am not sure whether | 34 |
|
| 6 | [was/were] not sure whether | 23 |
|
| 7 | was not sure whether | 19 |
|
| 8 | are not sure whether | 18 |
|
| 9 | 're not sure whether | 13 |
|
| 10 | [is] not sure whether | 10 |
|
| 11 | is not sure whether | 8 |
|
