| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | and it is [adv] difficult [verb] | 43 |
|
| 2 | and it is [adv] difficult [to-vb] | 43 |
|
| 3 | and it is [adv] difficult [verb] | 35 |
|
| 4 | and it is very difficult [verb] | 12 |
|
| 5 | and it is very difficult [verb] | 12 |
|
| 6 | and it is [not/n't] difficult [verb] | 8 |
|
| 7 | and it is not difficult [verb] | 8 |
|
| 8 | and it is not difficult [verb] | 8 |
|
| 9 | and it is often difficult [verb] | 5 |
|
| 10 | and it is often difficult [verb] | 5 |
|
