| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] [Wh det] [verb] [prep] | 176 |
|
| 2 | [be] [Wh det] happen [prep] | 106 |
|
| 3 | [is] [pron] happen [prep] | 95 |
|
| 4 | [is] [Wh det] happen [prep] | 93 |
|
