| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what happen | 5181 |
|
| 2 | [Wh det] happened | 3294 |
|
| 3 | [Wh det] happens | 2413 |
|
| 4 | whatever happen | 363 |
|
| 5 | which happen | 230 |
|
| 6 | [Wh det] happen | 72 |
|
