| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [adj] [to-vb] [det] [adj] [noun] | 239 |
|
| 2 | is [adj] [to-vb] [det] [adj] [noun] | 229 |
|
| 3 | be difficult [to-vb] [det] [adj] [noun] | 37 |
|
| 4 | [be] difficult [to-vb] [det] [adj] [noun] | 37 |
|
| 5 | is difficult [to-vb] [adj] [adj] [noun] | 34 |
|
| 6 | is difficult [verb] [det] [adj] [noun] | 30 |
|
| 7 | [is] difficult [to-vb] [det] [adj] [noun] | 29 |
|
| 8 | is difficult [to-vb] [det] [adj] [noun] | 29 |
|
