| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | when it [is] [verb] | 61 |
|
| 2 | when it [is] [vb pp] | 44 |
|
| 3 | when it is [verb] | 37 |
|
| 4 | when it 's [verb] | 24 |
|
| 5 | when it [is] [v-ing] | 17 |
|
