| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | when [pron] [be] [v-ing] | 3655 |
|
| 2 | [no cls] [pron] [be] [v-ing] | 1149 |
|
| 3 | [no cls] when [pron] [be] | 183 |
|
