| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | what had [verb] a | 17 |
|
| 2 | what [vb past] [vb pp] a | 16 |
|
| 3 | what [vb past] become a | 7 |
|
| 4 | what [vb past] become a | 6 |
|
