| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what is [vb pp] [prep] | 1306 |
|
| 2 | to what is [vb pp] | 118 |
|
| 3 | to what is [prep] | 31 |
|
| 4 | to is [vb pp] [prep] | 27 |
|
