| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be [adv] difficult [verb] [conj] | 226 |
|
| 2 | [be] [adv] difficult [verb] [conj] | 226 |
|
| 3 | 's [adv] [adj] [verb] [conj] | 122 |
|
| 4 | [is] [adv] difficult [verb] [conj] | 107 |
|
| 5 | 's [adv] [adj] [verb] [conj] | 104 |
|
| 6 | 's [adv] difficult [verb] [conj] | 14 |
|
| 7 | 's [adv] difficult [verb] [conj] | 12 |
|
