| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | has be [vb pp] possible by | 12 |
|
| 2 | has [be] [vb pp] possible by | 12 |
|
| 3 | has been [vb pp] possible by | 12 |
|
| 4 | has [been] [vb pp] possible by | 12 |
|
| 5 | has [be] made possible by | 12 |
|
