| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [to-vb] [conj] it [is] | 23 |
|
| 2 | [be] difficult [to-vb] [conj] it | 23 |
|
| 3 | difficult [to-vb] [conj] it [is] | 21 |
|
| 4 | [be] difficult [to-vb] [conj] [is] | 6 |
|
