| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is difficult [verb] the [noun] | 189 |
|
| 2 | it is difficult [to-vb] the [noun] | 189 |
|
| 3 | it is [adj] to identify the [noun] | 24 |
|
| 4 | it is difficult to identify [art] [noun] | 8 |
|
| 5 | it is difficult to identify [art] [noun] | 8 |
|
| 6 | [pron] is difficult to identify the [noun] | 7 |
|
| 7 | it be difficult to identify the [noun] | 7 |
|
| 8 | it is difficult to identify the [noun] | 7 |
|
| 9 | it [is] difficult to identify the [noun] | 7 |
|
| 10 | [pers pn] is difficult to identify the [noun] | 7 |
|
| 11 | it [be] difficult to identify the [noun] | 7 |
|
| 12 | it is difficult to identify the [noun] | 7 |
|
| 13 | it is difficult identify the [noun] | 7 |
|
