| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] [to-vb] what happened to | 17 |
|
| 2 | [vb infin] [to-vb] what happened to | 8 |
|
| 3 | [adj] [to-vb] what happened to | 5 |
|
| 4 | [adj] [to-vb] what happened to | 5 |
|
| 5 | [to-vb] [prep] what happened to | 7 |
|
| 6 | [to-vb] [prep] what happened to | 7 |
|
| 7 | [to-vb] what happened to [pron] | 14 |
|
| 8 | [to-vb] what happened to [pers pn] | 11 |
|
| 9 | [to-vb] what happened to [noun] | 7 |
|
| 10 | [to-vb] what happened to [noun prp] | 7 |
|
