| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] [adj] [to-vb] [conj] | 581 |
|
| 2 | it be [adv] difficult [to-vb] [conj] | 64 |
|
| 3 | it [be] [adv] difficult [to-vb] [conj] | 64 |
|
| 4 | it is [adv] difficult [to-vb] [conj] | 59 |
|
| 5 | it [is] [adv] difficult [to-vb] [conj] | 54 |
|
| 6 | [pron] is [adv] difficult [to-vb] [conj] | 45 |
|
| 7 | [pers pn] is [adv] difficult [to-vb] [conj] | 44 |
|
| 8 | it is [adv] difficult [verb] [conj] | 43 |
|
| 9 | it is [adv] difficult [to-vb] [conj] | 43 |
|
