| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [is] [adv] [adj] [verb] | 7463 |
|
| 2 | it [is] [adv] [adj] [verb] | 6861 |
|
| 3 | it [be] [adv] difficult [verb] | 1078 |
|
| 4 | [pron] [is] [adv] difficult [verb] | 953 |
|
| 5 | it [is] [adv] difficult [verb] | 919 |
|
