| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | who do [not/n't] know | 244 |
|
| 2 | who do n't know | 132 |
|
| 3 | who do [not/n't] know | 113 |
|
| 4 | who do not know | 110 |
|
| 5 | who did [not/n't] know | 92 |
|
| 6 | who does [not/n't] know | 39 |
|
