| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [be] [verb] to be difficult | 20 |
|
| 2 | it [be] [verb] to [be] difficult | 20 |
|
| 3 | it be [verb] to [be] difficult | 20 |
|
| 4 | it [be] go to [be] difficult | 19 |
|
| 5 | it [be] going to [be] difficult | 19 |
|
| 6 | it [be] [v-ing] to [be] difficult | 19 |
|
| 7 | it [is] [verb] to [be] difficult | 18 |
|
| 8 | it 's [verb] to [be] difficult | 16 |
|
