| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] what [vb -s] happened [prep] the | 9 |
|
| 2 | be [Wh det] [vb -s] happened [prep] the | 9 |
|
| 3 | [is] [Wh det] [vb -s] happened [prep] the | 9 |
|
| 4 | is [Wh det] [vb -s] happened [prep] the | 6 |
|
| 5 | [be] [Wh det] has happened [prep] the | 5 |
|
