| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | when [v-ing] [prep] | 1529 |
|
| 2 | when [v-ing] [prep] | 1529 |
|
| 3 | [conj] [v-ing] at | 1428 |
|
| 4 | when [verb] at | 231 |
|
| 5 | when [v-ing] at | 140 |
|
