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