| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [v-ing] [prep] happen [adj] | 5 |
|
| 2 | be [v-ing] [prep] happen [adj] | 5 |
|
| 3 | [v-ing] [prep] happen [prep] [adj] | 8 |
|
| 4 | [v-ing] [prep] happen [prep] [adj] | 8 |
|
