| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [modal v] not be sure [Wh det] | 12 |
|
| 2 | can [adv] be sure [Wh det] | 11 |
|
| 3 | can not be sure [Wh det] | 10 |
|
| 4 | can [not/n't] be sure [Wh det] | 10 |
|
| 5 | can not be [adj] [Wh det] | 8 |
|
| 6 | can not be sure [pron] | 8 |
|
| 7 | can not be sure [Wh det] | 6 |
|
| 8 | can not [be] sure [Wh det] | 6 |
|
| 9 | can not [be] sure [Wh det] | 6 |
|
