| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [coord] it is [adv] difficult [to-vb] | 75 |
|
| 2 | [coord] it is [adv] difficult [verb] | 62 |
|
| 3 | and it is [adv] difficult [verb] | 43 |
|
| 4 | but it is [adv] difficult [verb] | 32 |
|
| 5 | [coord] it is very difficult [verb] | 23 |
|
| 6 | [coord] it is very difficult [verb] | 23 |
|
| 7 | [coord] it is [not/n't] difficult [verb] | 13 |
|
| 8 | [coord] it is not difficult [verb] | 13 |
|
| 9 | [coord] it is not difficult [verb] | 13 |
|
| 10 | [coord] it is often difficult [verb] | 9 |
|
| 11 | [coord] it is often difficult [verb] | 9 |
|
| 12 | [coord] it is [adv] difficult see | 5 |
|
| 13 | [coord] it is extremely difficult [verb] | 5 |
|
| 14 | [coord] it is [adv] difficult to see | 5 |
|
| 15 | [coord] it is extremely difficult [verb] | 5 |
|
