| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] what [vb past] [prep] | 811 |
|
| 2 | what [vb past] [prep] [noun] | 449 |
|
| 3 | [prep] what [vb past] [noun] | 48 |
|
| 4 | [prep] [vb past] [prep] [noun] | 46 |
|
| 5 | [prep] what [prep] [noun] | 34 |
|
