| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | and it [is] [adv] difficult [to-vb] | 57 |
|
| 2 | and it [is] [adv] difficult [to-vb] | 47 |
|
| 3 | and it is [adv] difficult [to-vb] | 43 |
|
| 4 | and it [is] very difficult [to-vb] | 22 |
|
| 5 | and it [is] very difficult [to-vb] | 22 |
|
| 6 | and it 's [adv] difficult [to-vb] | 14 |
|
| 7 | and it [is] not difficult [to-vb] | 10 |
|
| 8 | and it [is] [not/n't] difficult [to-vb] | 10 |
|
| 9 | and it [is] not difficult [to-vb] | 10 |
|
| 10 | and it [is] often difficult [to-vb] | 5 |
|
| 11 | and it [is] often difficult [to-vb] | 5 |
|
