| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] difficult [prep] | 111 |
|
| 2 | it is extremely [adj] [prep] | 33 |
|
| 3 | it be extremely difficult [prep] | 16 |
|
| 4 | it [be] extremely difficult [prep] | 16 |
|
| 5 | it [is] extremely difficult [prep] | 13 |
|
| 6 | [pron] is extremely difficult [prep] | 11 |
|
| 7 | it is extremely difficult [prep] | 11 |
|
| 8 | [pers pn] is extremely difficult [prep] | 11 |
|
