| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is always [adv] difficult | 6 |
|
| 2 | it is always [adv] difficult | 6 |
|
| 3 | it is always difficult [verb] | 18 |
|
| 4 | it is always difficult [to-vb] | 17 |
|
| 5 | it is always difficult [prep] | 5 |
|
| 6 | it is always difficult [prep] | 5 |
|
