| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] [verb] to [be] | 2346 |
|
| 2 | [Wh det] [vb past] to [be] | 896 |
|
| 3 | [pron] happened to [be] | 236 |
|
| 4 | [Wh det] happen to [be] | 59 |
|
| 5 | [Wh det] happened [prep] [be] | 18 |
|
