| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [adv] [adj] [to-vb] [verb] | 148 |
|
| 2 | is [adv] [adj] [to-vb] [verb] | 140 |
|
| 3 | [be] [adv] difficult [to-vb] [verb] | 21 |
|
| 4 | be [adv] difficult [to-vb] [verb] | 21 |
|
| 5 | [is] [adv] difficult [to-vb] [verb] | 7 |
|
| 6 | is [adv] difficult [to-vb] [verb] | 6 |
|
| 7 | is [adv] difficult [verb] [verb] | 5 |
|
| 8 | is [adv] difficult [to-vb] [verb] | 5 |
|
