| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [to-vb] [conj] it [verb] | 759 |
|
| 2 | difficult [to-vb] [conj] [verb] | 157 |
|
| 3 | difficult [to-vb] [conj] it | 60 |
|
| 4 | difficult [conj] it [verb] | 32 |
|
| 5 | difficult [to-vb] it [verb] | 5 |
|
