| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh pn] [verb] to [be] | 818 |
|
| 2 | [Wh pn] [vb past] to [be] | 374 |
|
| 3 | [pron] happened to [be] | 236 |
|
| 4 | [Wh pn] happen to [be] | 118 |
|
| 5 | [Wh pn] happened [prep] [be] | 59 |
|
