| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] know for certain | 34 |
|
| 2 | not know for [adj] | 23 |
|
| 3 | not know for [adj] | 21 |
|
| 4 | [not/n't] know for certain | 20 |
|
| 5 | not know for certain | 20 |
|
| 6 | not [verb] for certain | 15 |
|
| 7 | not know [prep] certain | 12 |
|
| 8 | not know [prep] certain | 12 |
|
| 9 | not know for certain | 12 |
|
| 10 | not know for certain | 12 |
|
