| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | when [verb] this | 83 |
|
| 2 | when [v-ing] this | 77 |
|
| 3 | when use this | 14 |
|
| 4 | when using this | 14 |
|
| 5 | when doing this | 6 |
|
| 6 | when do this | 6 |
|
| 7 | when [vb pp] this | 5 |
|
