| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] difficult it be [prep] [pron] | 10 |
|
| 2 | how difficult it be [prep] [pron] | 7 |
|
| 3 | [Wh adv] difficult it be [prep] [pron] | 7 |
|
| 4 | how difficult it be [prep] [pron] | 7 |
|
| 5 | difficult it be [prep] [pron] [verb] | 7 |
|
| 6 | difficult it be [prep] [pron] [to-vb] | 7 |
|
