| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it 's [adv] difficult [to-vb] | 209 |
|
| 2 | it 's [adv] difficult [to-vb] | 194 |
|
| 3 | it 's [adv] [adv] [to-vb] | 62 |
|
| 4 | it 's [adv] [adv] difficult | 58 |
|
| 5 | it [adv] [adv] difficult [to-vb] | 33 |
|
| 6 | 's [adv] [adv] difficult [to-vb] | 17 |
|
