| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] know what happened to | 27 |
|
| 2 | [not/n't] know what happened to | 24 |
|
| 3 | not know what happened to | 24 |
|
| 4 | n't know what happened to | 21 |
|
| 5 | [pron] know what happened to | 7 |
|
| 6 | know what happened to [pron] | 25 |
|
| 7 | know what happened to [pers pn] | 21 |
|
| 8 | know what happened to he | 6 |
|
| 9 | know what happened to [noun] | 6 |
|
| 10 | know what happened to him | 6 |
|
