| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] what [verb] [prep] | 236 |
|
| 2 | [adv] what happen [prep] | 138 |
|
| 3 | [adv] what happened [prep] | 102 |
|
| 4 | [adv] what [vb past] [prep] | 100 |
|
| 5 | [adv] [pron] happened [prep] | 98 |
|
| 6 | [adv] [Wh det] happened [prep] | 82 |
|
| 7 | [adv] what happened [prep] | 79 |
|
