| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [to-vb] [conj] it [is] | 938 |
|
| 2 | difficult [to-vb] [conj] it | 60 |
|
| 3 | difficult [conj] it [is] | 26 |
|
| 4 | difficult [to-vb] [conj] [is] | 8 |
|
