| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh adv] [adj] it [be] [prep] | 230 |
|
| 2 | [adv] difficult it [be] [prep] | 35 |
|
| 3 | [Wh adv] difficult it [be] [prep] | 31 |
|
| 4 | [Wh adv] difficult [pron] [be] [prep] | 31 |
|
| 5 | [Wh adv] difficult [pers pn] [be] [prep] | 31 |
|
