| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be difficult [prep] [noun pl] [to-vb] | 36 |
|
| 2 | it be [prep] [noun pl] [to-vb] | 30 |
|
| 3 | it be difficult [prep] [noun pl] | 30 |
|
| 4 | it difficult [prep] [noun pl] [to-vb] | 23 |
|
