| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what [vb past] [art] | 551 |
|
| 2 | [vb past] cause [art] | 164 |
|
| 3 | what cause [art] | 69 |
|
| 4 | what [vb past] cause | 28 |
|
