| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh det] is [prep] [noun] | 692 |
|
| 2 | [Wh det] happen [prep] [noun] | 532 |
|
| 3 | [Wh det] is happen [prep] | 324 |
|
| 4 | is happen [prep] [noun] | 91 |
|
