| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what is [vb pp] [prep] | 1306 |
|
| 2 | [be] what is [vb pp] | 156 |
|
| 3 | [be] is [vb pp] [prep] | 30 |
|
| 4 | [be] what is [prep] | 17 |
|
