| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | happen is | 477 |
|
| 2 | happen was | 231 |
|
| 3 | happened be | 201 |
|
| 4 | happens be | 166 |
|
| 5 | happened be | 124 |
|
| 6 | happening be | 95 |
|
| 7 | happen be | 78 |
|
| 8 | to happen be | 57 |
|
| 9 | happen are | 22 |
|
| 10 | happen be | 19 |
|
| 11 | happen were | 8 |
|
