| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it 's [adv] [adv] [adj] [to-vb] | 233 |
|
| 2 | it 's [adv] [adv] [adj] [to-vb] | 209 |
|
| 3 | it [be] [adv] [adv] difficult [to-vb] | 154 |
|
| 4 | it be [adv] [adv] difficult [to-vb] | 154 |
|
| 5 | it [is] [adv] [adv] difficult [to-vb] | 135 |
|
| 6 | it 's [adv] [adv] difficult [verb] | 15 |
|
| 7 | it 's [adv] [adv] difficult [to-vb] | 15 |
|
| 8 | [pron] 's [adv] [adv] difficult [to-vb] | 15 |
|
| 9 | it 's [adv] [adv] difficult [to-vb] | 15 |
|
