| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] when a | 749 |
|
| 2 | happen when [art] | 206 |
|
| 3 | happen when [art] | 206 |
|
| 4 | happen [conj] a | 117 |
|
| 5 | happen when a | 58 |
|
