| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | when [pron] [be] [v-ing] | 3655 |
|
| 2 | [noun prp] [pron] [be] [v-ing] | 989 |
|
| 3 | [noun prp] when [pron] [be] | 466 |
|
