| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [be] difficult [to-vb] [adj] [noun pl] | 68 |
|
| 2 | it be difficult [to-vb] [adj] [noun pl] | 68 |
|
| 3 | it [is] difficult [to-vb] [adj] [noun pl] | 53 |
|
| 4 | it is difficult [to-vb] [adj] [noun pl] | 52 |
|
| 5 | it [be] difficult [to-vb] [adj] [noun pl] | 43 |
|
| 6 | it [be] difficult [to-vb] [det] [noun pl] | 24 |
|
| 7 | it was difficult [to-vb] [adj] [noun pl] | 15 |
|
| 8 | it [was/were] difficult [to-vb] [adj] [noun pl] | 15 |
|
| 9 | it [be] difficult [to-vb] these [noun pl] | 12 |
|
| 10 | it [be] difficult [to-vb] these [noun pl] | 12 |
|
| 11 | it [be] difficult to find [adj] [noun pl] | 7 |
|
| 12 | it [be] difficult [to-vb] precise [noun pl] | 5 |
|
| 13 | it [be] difficult [to-vb] precise [noun pl] | 5 |
|
