| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | before it [is] possible [to-vb] | 7 |
|
| 2 | before it [is] possible [verb] | 7 |
|
| 3 | before it is possible [verb] | 7 |
|
| 4 | before it [is] possible [verb] | 7 |
|
