| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have happened | 4405 |
|
| 2 | had happen | 1817 |
|
| 3 | has happen | 1050 |
|
| 4 | 's happen | 759 |
|
| 5 | have happen | 644 |
|
| 6 | to have happen | 101 |
|
| 7 | have happen | 95 |
|
| 8 | have to happen | 81 |
|
| 9 | 've happen | 9 |
|
| 10 | having happen | 8 |
|
| 11 | 'd happen | 6 |
|
