| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [adj] it [is] [prep] | 175 |
|
| 2 | [adv] difficult it [be] [prep] | 35 |
|
| 3 | [adv] difficult [pers pn] [is] [prep] | 24 |
|
| 4 | [adv] difficult [pron] [is] [prep] | 24 |
|
| 5 | [adv] difficult it [is] [prep] | 24 |
|
