| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pron] [be] [v-ing] [prep] | 41273 |
|
| 2 | when [pron] [be] [v-ing] | 3655 |
|
| 3 | when [pron] [be] [prep] | 2050 |
|
| 4 | when [pron] [v-ing] [prep] | 35 |
|
