| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] difficult [verb] | 705 |
|
| 2 | and it is [adv] [verb] | 275 |
|
| 3 | and it is difficult [verb] | 85 |
|
| 4 | and it is [adv] difficult | 56 |
|
| 5 | and is [adv] difficult [verb] | 14 |
|
