| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be difficult [to-vb] [conj] this [is] | 8 |
|
| 2 | [be] difficult [to-vb] [conj] this [is] | 8 |
|
| 3 | [is] difficult [to-vb] [conj] this [is] | 7 |
|
| 4 | is difficult [to-vb] [conj] this [is] | 7 |
|
