| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb pp] when it [is] | 80 |
|
| 2 | [vb pp] when it [is] | 78 |
|
| 3 | [vb pp] when it is | 73 |
|
| 4 | [vb pp] when it 's | 7 |
|
