| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is to be made [adj] | 16 |
|
| 2 | is to be [vb pp] available | 8 |
|
| 3 | is to be considered [adj] | 6 |
|
| 4 | is to be left [adj] | 5 |
|
