| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what is [vb pp] [prep] | 1306 |
|
| 2 | know what is [vb pp] | 41 |
|
| 3 | know what is [prep] | 33 |
|
| 4 | know is [vb pp] [prep] | 21 |
|
