| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [is] [adv] difficult do | 12 |
|
| 2 | it [is] [adv] difficult to do | 12 |
|
| 3 | it [is] very difficult do | 10 |
|
| 4 | it 's [adv] difficult do | 7 |
|
| 5 | it is [adv] difficult do | 5 |
|
