| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] difficult [verb] | 558 |
|
| 2 | [noun] it is [adv] [verb] | 206 |
|
| 3 | [noun] is [adv] difficult [verb] | 146 |
|
| 4 | [noun] it is difficult [verb] | 109 |
|
| 5 | [noun] it is [adv] difficult | 52 |
|
