| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [not/n't] sure that [pers pn] do | 9 |
|
| 2 | [not/n't] sure that [pron] do | 9 |
|
| 3 | not sure that [pron] do | 8 |
|
| 4 | [not/n't] sure that [pron] did | 6 |
|
