| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what is happen [prep] | 319 |
|
| 2 | [adv] what happen [prep] | 180 |
|
| 3 | [adv] what is [prep] | 47 |
|
| 4 | [adv] what is happen | 35 |
|
