| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | not [vb infin] what happened to | 40 |
|
| 2 | n't [verb] what happened to | 34 |
|
| 3 | not know what happened to | 24 |
|
| 4 | not know what happened to | 24 |
|
| 5 | not care what happened to | 7 |
|
| 6 | not care what happened to | 7 |
|
| 7 | not [verb] what happened to | 6 |
|
