| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [verb] [that] a [noun] | 158 |
|
| 2 | is difficult [verb] a [noun] | 41 |
|
| 3 | is difficult [verb] [that] [noun] | 17 |
|
| 4 | difficult [verb] [that] a [noun] | 16 |
|
| 5 | is difficult [verb] [that] a | 10 |
|
