| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | 's [adv] [v-ing] [prep] happen | 7 |
|
| 2 | [is] [adv] [v-ing] [prep] happen | 7 |
|
| 3 | [be] [adv] [v-ing] [prep] happen | 7 |
|
| 4 | be [adv] [v-ing] [prep] happen | 7 |
|
