| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be possible to obtain | 51 |
|
| 2 | [be] possible to obtain | 51 |
|
| 3 | [is] possible to obtain | 31 |
|
| 4 | is possible to obtain | 31 |
|
| 5 | [be] possible to obtain | 11 |
|
| 6 | be possible to obtain | 11 |
|
| 7 | was possible to obtain | 6 |
|
| 8 | [was/were] possible to obtain | 6 |
|
