| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [is] [adj] [verb] [adj] [noun pl] | 465 |
|
| 2 | [is] difficult [verb] [adj] [noun] | 64 |
|
| 3 | [be] difficult [verb] [adj] [noun pl] | 60 |
|
| 4 | [is] difficult [verb] [adj] [noun pl] | 55 |
|
