| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [to-vb] what have [vb pp] to | 32 |
|
| 2 | [to-vb] what have happen to | 30 |
|
| 3 | [to-vb] what have happened to | 30 |
|
| 4 | [to-vb] what had [verb] to | 20 |
|
| 5 | to know what have [verb] to | 11 |
|
| 6 | to see what have [verb] to | 8 |
|
| 7 | [to-vb] what has [verb] to | 6 |
|
| 8 | [to-vb] what 's [verb] to | 6 |
|
