| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is difficult [prep] [adv] [vb infin] | 7 |
|
| 2 | it is difficult [prep] [adv] [vb infin] | 7 |
|
| 3 | [pron] is difficult [prep] [adv] [vb infin] | 7 |
|
| 4 | [pers pn] is difficult [prep] [adv] [vb infin] | 7 |
|
