| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] difficult it is [prep] [noun] | 11 |
|
| 2 | how difficult it is [prep] [noun] | 10 |
|
| 3 | [Wh adv] difficult it is [prep] [noun] | 10 |
|
| 4 | how difficult it is [prep] [noun] | 10 |
|
| 5 | difficult it is [prep] [noun] [verb] | 8 |
|
| 6 | difficult it is [prep] [noun] [to-vb] | 8 |
|
