| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [adj] [verb] [det] [adj] [noun] | 243 |
|
| 2 | is [adj] [verb] [det] [adj] [noun] | 233 |
|
| 3 | be difficult [verb] [det] [adj] [noun] | 38 |
|
| 4 | [be] difficult [verb] [det] [adj] [noun] | 38 |
|
| 5 | is difficult [verb] [adj] [adj] [noun] | 35 |
|
| 6 | is difficult [verb] [det] [adj] [noun] | 30 |
|
| 7 | [is] difficult [verb] [det] [adj] [noun] | 30 |
|
