| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh adv] difficult it be [prep] | 31 |
|
| 2 | [Wh adv] difficult it [be] [prep] | 31 |
|
| 3 | [Wh adv] difficult it [be] [prep] | 31 |
|
| 4 | how difficult it [be] [prep] | 31 |
|
| 5 | [Wh adv] difficult it [be] for | 25 |
|
| 6 | [Wh adv] difficult it [be] for | 25 |
|
| 7 | [Wh adv] difficult it [is] [prep] | 21 |
|
| 8 | [Wh adv] difficult it is [prep] | 21 |
|
| 9 | [Wh adv] difficult it [was/were] [prep] | 10 |
|
| 10 | [Wh adv] difficult it was [prep] | 10 |
|
