| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] not [adv] sure | 608 |
|
| 2 | [be] not sure whether | 180 |
|
| 3 | not [adv] sure whether | 32 |
|
| 4 | [be] [adv] sure whether | 15 |
|
| 5 | [be] not [adv] whether | 7 |
|
