| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which [vb base] to explain [art] | 9 |
|
| 2 | [Wh det] [vb base] to explain the | 9 |
|
| 3 | [Wh det] [vb base] to explain [art] | 9 |
|
| 4 | [Wh det] [vb base] to explain the | 9 |
|
