| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [prep] [noun] very difficult | 5 |
|
| 2 | [noun] [prep] [noun] very difficult | 5 |
|
| 3 | [noun] [noun] be very difficult | 11 |
|
| 4 | [noun] [noun] [be] very difficult | 11 |
|
| 5 | [noun] [noun] [is] very difficult | 9 |
|
| 6 | [noun] [noun] is very difficult | 9 |
|
| 7 | [noun] [noun] [verb] very difficult | 5 |
|
