| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] happen [be] | 162 |
|
| 2 | 's [verb] [be] | 143 |
|
| 3 | have happen [be] | 117 |
|
| 4 | [vb -s] happen [be] | 88 |
|
