| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] [adv] [been] formed | 13 |
|
| 2 | had [adv] [be] formed | 13 |
|
| 3 | [vb past] [adv] be formed | 13 |
|
| 4 | [vb past] [adv] been formed | 13 |
|
