| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | and it is [verb] [prep] | 200 |
|
| 2 | it is difficult [verb] [prep] | 143 |
|
| 3 | and it is difficult [verb] | 85 |
|
| 4 | and it is difficult [prep] | 17 |
|
