| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | when it [was/were] [verb] | 764 |
|
| 2 | but it [was/were] [verb] | 533 |
|
| 3 | but when it [verb] | 255 |
|
| 4 | but when it [was/were] | 20 |
|
