| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb pp] [conj] it [is] | 1509 |
|
| 2 | [verb] when it [is] | 183 |
|
| 3 | [vb pp] when [pron] [is] | 138 |
|
| 4 | [vb pp] when it [be] | 137 |
|
