| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [be] [vb pp] desirable | 10 |
|
| 2 | it be [vb pp] desirable | 10 |
|
| 3 | it [be] [vb pp] desirable | 10 |
|
| 4 | it [is] [vb pp] desirable | 6 |
|
| 5 | it is [vb pp] desirable | 6 |
|
| 6 | it [be] thought desirable | 5 |
|
