| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] for certain | 235 |
|
| 2 | know for certain | 110 |
|
| 3 | knows for [adj] | 21 |
|
| 4 | [vb -s] for certain | 19 |
|
| 5 | knows [prep] certain | 7 |
|
| 6 | knows for certain | 7 |
|
| 7 | knows [prep] certain | 7 |
|
