| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what happened [prep] | 1257 |
|
| 2 | what happen to | 1120 |
|
| 3 | what happens [prep] | 787 |
|
| 4 | what happen in | 437 |
|
| 5 | what happen at | 125 |
|
| 6 | what happen with | 82 |
|
| 7 | what happen on | 77 |
|
| 8 | what happen after | 54 |
|
| 9 | what happen during | 31 |
|
| 10 | what happen between | 25 |
|
| 11 | what happen about | 18 |
|
| 12 | what happen from | 11 |
|
| 13 | what happen before | 9 |
|
| 14 | what happen under | 7 |
|
| 15 | what happen over | 7 |
|
| 16 | what happen within | 6 |
|
| 17 | what happen inside | 6 |
|
| 18 | what happen as | 5 |
|
