| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [adj] [verb] [noun pl] | 838 |
|
| 2 | is difficult [verb] [noun] | 118 |
|
| 3 | [be] difficult [verb] [noun pl] | 86 |
|
| 4 | be difficult [verb] [noun pl] | 86 |
|
| 5 | [is] difficult [verb] [noun pl] | 54 |
|
