| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] happened [prep] [adj] [noun] | 71 |
|
| 2 | be [Wh det] happened [prep] [noun] | 19 |
|
| 3 | be [Wh det] happened [prep] [adj] | 10 |
|
| 4 | be [Wh det] [prep] [adj] [noun] | 5 |
|
