| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [pers pn] is difficult [to-vb] [conj] a | 12 |
|
| 2 | [pron] is difficult [to-vb] [conj] a | 12 |
|
| 3 | it is difficult [to-vb] [conj] a | 12 |
|
| 4 | it is difficult [to-vb] [conj] a | 12 |
|
| 5 | is [adv] difficult [to-vb] [conj] a | 7 |
|
| 6 | is [adv] difficult [to-vb] [conj] a | 6 |
|
| 7 | is difficult [to-vb] [conj] a [noun sg] | 11 |
|
| 8 | is difficult [to-vb] [conj] a [noun] | 11 |
|
