| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [Wh det] was [verb] | 1427 |
|
| 2 | [prep] [Wh det] [be] happen | 563 |
|
| 3 | [prep] [Wh det] be happen | 563 |
|
| 4 | [prep] [pron] was happen | 202 |
|
| 5 | [prep] [Wh det] was happen | 201 |
|
| 6 | [prep] [Wh det] [was/were] happen | 201 |
|
