| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] [adv] [adj] [to-vb] [conj] [art] | 252 |
|
| 2 | [is] [adv] [adj] [to-vb] [conj] [art] | 234 |
|
| 3 | [be] [adv] difficult [to-vb] [conj] [art] | 40 |
|
| 4 | [is] [adv] difficult [to-vb] [conj] [art] | 29 |
|
| 5 | [is] [adv] difficult [to-vb] [conj] [art] | 24 |
|
| 6 | [is] [adv] difficult [verb] [conj] [art] | 24 |
|
