| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | when [vb pp] [prep] | 3154 |
|
| 2 | when [vb pp] [prep] | 3154 |
|
| 3 | [conj] [vb pp] at | 1504 |
|
| 4 | when [verb] at | 231 |
|
| 5 | when [vb pp] at | 89 |
|
