| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [vb past] become a | 57 |
|
| 2 | it [vb past] become a | 55 |
|
| 3 | it had become a | 55 |
|
| 4 | it [vb past] become a | 48 |
|
| 5 | it [vb past] become an | 9 |
|
