| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] when [v-ing] a | 14 |
|
| 2 | [prep] when [verb] a | 14 |
|
| 3 | for when [verb] a | 9 |
|
| 4 | for when [verb] a | 9 |
|
| 5 | [prep] when choose a | 6 |
|
| 6 | [prep] when choosing a | 6 |
|
