| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it be [adj] [prep] be certain | 19 |
|
| 2 | it be [adj] to [be] certain | 19 |
|
| 3 | it be [adj] [prep] [be] certain | 19 |
|
| 4 | it is [adj] [prep] [be] certain | 18 |
|
| 5 | it be difficult [prep] [be] certain | 10 |
|
| 6 | it be impossible [prep] [be] certain | 7 |
|
