| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [v-ing] when [pron] [verb] | 180 |
|
| 2 | be [v-ing] [conj] it [verb] | 75 |
|
| 3 | be [verb] when it [verb] | 62 |
|
| 4 | [be] [v-ing] when it [verb] | 7 |
|
