| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [pron] [pron] happened [prep] [be] | 5 |
|
| 2 | [prep] [pron] [pron] happened [prep] [be] | 5 |
|
| 3 | [pron] [pron] happened [prep] [be] [v-ing] | 5 |
|
| 4 | [pron] [pron] happened [prep] [be] [verb] | 5 |
|
