| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it difficult [to-vb] [art] [adj] [noun] | 60 |
|
| 2 | it difficult [to-vb] [art] [adj] [noun] | 56 |
|
| 3 | it difficult [to-vb] [art] [adj] [noun sg] | 47 |
|
| 4 | it difficult [to-vb] the [adj] [noun] | 35 |
|
| 5 | it difficult [to-vb] a [adj] [noun] | 21 |
|
| 6 | it difficult [to-vb] [art] [adj] [noun pl] | 13 |
|
| 7 | it difficult to get [art] [adj] [noun] | 6 |
|
| 8 | it difficult to maintain [art] [adj] [noun] | 5 |
|
