| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] ever happened [prep] | 16 |
|
| 2 | [vb past] ever happen [prep] | 16 |
|
| 3 | had ever happen [prep] | 16 |
|
| 4 | [vb past] ever happen to | 12 |
|
| 5 | [vb past] ever happen to | 12 |
|
