| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [pron] [v-ing] | 6791 |
|
| 2 | [prep] [pron] when | 2115 |
|
| 3 | [pron] when [v-ing] | 110 |
|
| 4 | [prep] when [v-ing] | 77 |
|
