| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] when a | 749 |
|
| 2 | occurs when [art] | 129 |
|
| 3 | occurs when [art] | 129 |
|
| 4 | [vb -s] when a | 114 |
|
| 5 | occur when a | 62 |
|
| 6 | occurs [conj] a | 49 |
|
| 7 | occurs when a | 40 |
|
