| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] and it is very difficult | 9 |
|
| 2 | [noun sg] and it is very difficult | 8 |
|
| 3 | and it is very difficult [to-vb] | 12 |
|
| 4 | and it is very difficult [verb] | 12 |
|
