| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [adj] [verb] [adv] [conj] | 158 |
|
| 2 | [be] difficult [verb] [adv] [conj] | 24 |
|
| 3 | be difficult [verb] [adv] [conj] | 24 |
|
| 4 | is difficult [verb] [adv] [conj] | 15 |
|
| 5 | [is] difficult [verb] [adv] [conj] | 14 |
|
