| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what has happened [prep] [adj] | 31 |
|
| 2 | what have happened [prep] [adj] | 17 |
|
| 3 | what [verb] happened [prep] [adj] | 17 |
|
| 4 | what [vb -s] happened [prep] [adj] | 14 |
|
| 5 | what has [verb] [prep] [adj] | 13 |
|
| 6 | [pron] has happened [prep] [adj] | 13 |
|
| 7 | what has [vb pp] [prep] [adj] | 13 |
|
| 8 | what has happen [prep] [adj] | 10 |
|
