| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] happen [is] | 53 |
|
| 2 | [is] happen is | 53 |
|
| 3 | [is] happen be | 53 |
|
| 4 | [is] happening [be] | 52 |
|
| 5 | is happen [be] | 29 |
|
| 6 | 's happen [be] | 24 |
|
