| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [subord] it happens to | 33 |
|
| 2 | [subord] it happened to | 24 |
|
| 3 | if it happen to | 22 |
|
| 4 | when it happen to | 14 |
|
| 5 | because it happen to | 10 |
|
| 6 | until it happen to | 5 |
|
