| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be not certain whether | 25 |
|
| 2 | [be] not certain whether | 25 |
|
| 3 | [is] not certain whether | 14 |
|
| 4 | is not certain whether | 13 |
|
| 5 | was not certain whether | 6 |
|
| 6 | [was/were] not certain whether | 6 |
|
| 7 | [am/are] not certain whether | 5 |
|
