| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | know for certain | 110 |
|
| 2 | knew for certain | 27 |
|
| 3 | know for certain | 26 |
|
| 4 | know for certain | 21 |
|
| 5 | known for certain | 20 |
|
| 6 | knows for certain | 7 |
|
| 7 | to know for certain | 6 |
|
