| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what is [vb pp] [prep] | 1306 |
|
| 2 | [adv] is [vb pp] [prep] | 454 |
|
| 3 | [adv] what is [vb pp] | 156 |
|
| 4 | [adv] what is [prep] | 37 |
|
