| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [modal v] be difficult [prep] | 100 |
|
| 2 | it be difficult [prep] them | 17 |
|
| 3 | it [modal v] be [prep] them | 8 |
|
| 4 | [modal v] be difficult [prep] them | 7 |
|
