| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what is [vb pp] [prep] [art] | 490 |
|
| 2 | [be] what is [vb pp] [prep] | 84 |
|
| 3 | [be] what is [vb pp] [art] | 13 |
|
| 4 | [be] is [vb pp] [prep] [art] | 11 |
|
