| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] it [art] difficult [noun] | 6 |
|
| 2 | it [be] [art] difficult [noun] | 109 |
|
| 3 | it be [art] difficult [noun] | 109 |
|
| 4 | it [is] [art] difficult [noun] | 66 |
|
| 5 | it was [art] difficult [noun] | 43 |
|
| 6 | it [was/were] [art] difficult [noun] | 43 |
|
| 7 | it 's [art] difficult [noun] | 36 |
|
| 8 | it is [art] difficult [noun] | 30 |
|
