| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] when a | 749 |
|
| 2 | [vb past] when a | 125 |
|
| 3 | happen when a | 45 |
|
| 4 | happened when [art] | 39 |
|
| 5 | happened when [art] | 39 |
|
| 6 | happened [conj] a | 18 |
|
| 7 | happened when a | 12 |
|
