| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] [vb pp] it | 3806 |
|
| 2 | [vb pp] if it | 326 |
|
| 3 | [vb past] if it | 159 |
|
| 4 | [vb past] [vb pp] if | 55 |
|
