| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [no cls] it 's [adv] difficult [to-vb] | 13 |
|
| 2 | erm it 's [adv] difficult [verb] | 10 |
|
| 3 | [no cls] it 's very difficult [verb] | 9 |
|
