| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it 's [adv] difficult [verb] | 199 |
|
| 2 | it 's [adv] difficult [to-vb] | 194 |
|
| 3 | it 's [adv] [adj] to know | 35 |
|
| 4 | it 's [adv] [adj] to know | 33 |
|
| 5 | it be [adv] difficult to know | 23 |
|
| 6 | it [be] [adv] difficult to know | 23 |
|
| 7 | it [is] [adv] difficult to know | 20 |
|
| 8 | it 's [adv] difficult know | 6 |
|
| 9 | it 's [adv] difficult to know | 6 |
|
| 10 | [pers pn] 's [adv] difficult to know | 6 |
|
| 11 | it 's [adv] difficult to know | 6 |
|
| 12 | it 's [adv] difficult to know | 6 |
|
| 13 | [pron] 's [adv] difficult to know | 6 |
|
