| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | had [been] convert into | 11 |
|
| 2 | [vb past] been convert into | 11 |
|
| 3 | [vb past] [been] convert into | 11 |
|
| 4 | [vb past] [been] converted into | 11 |
|
