| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [Wh det] have happened [prep] | 198 |
|
| 2 | [prep] [Wh det] [verb] happened [prep] | 198 |
|
| 3 | [prep] [Wh det] has [vb pp] [prep] | 104 |
|
| 4 | [prep] [Wh det] has [verb] [prep] | 104 |
|
| 5 | [prep] [Wh det] [vb -s] happened [prep] | 86 |
|
| 6 | [prep] [Wh det] has happened [prep] | 62 |
|
| 7 | [prep] [Wh det] has happen [prep] | 62 |
|
| 8 | [prep] [Wh det] has happened [prep] | 62 |
|
| 9 | [prep] [pron] has happened [prep] | 62 |
|
