| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] difficult [verb] [pos pn] [noun sg] | 21 |
|
| 2 | [is] difficult [to-vb] [pos pn] [noun sg] | 21 |
|
| 3 | is difficult [verb] [pos pn] [noun sg] | 19 |
|
| 4 | [is] difficult [verb] its [noun sg] | 7 |
|
| 5 | [is] difficult [verb] their [noun sg] | 6 |
|
