| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is difficult [verb] [adj] | 197 |
|
| 2 | is difficult [verb] [det] | 117 |
|
| 3 | is [adj] [verb] these | 111 |
|
| 4 | be difficult [verb] these | 18 |
|
| 5 | [be] difficult [verb] these | 18 |
|
| 6 | [is] difficult [verb] these | 14 |
|
| 7 | is difficult [verb] these | 13 |
|
