| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] difficult [to-vb] [is] [art] | 11 |
|
| 2 | [adv] difficult [to-vb] [is] [art] | 11 |
|
| 3 | more difficult [to-vb] [is] [art] | 8 |
|
| 4 | more difficult [to-vb] [is] [art] | 8 |
|
| 5 | difficult [to-vb] [pron] [is] [art] | 5 |
|
| 6 | difficult [to-vb] [is] [art] [noun] | 9 |
|
| 7 | difficult [to-vb] [is] [art] [noun sg] | 7 |
|
| 8 | difficult [to-vb] [is] [art] [adj] | 6 |
|
| 9 | difficult [to-vb] [is] [art] [adj] | 6 |
|
