| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it is [adv] difficult [verb] | 705 |
|
| 2 | which it is [adv] [verb] | 59 |
|
| 3 | which it is difficult [verb] | 21 |
|
| 4 | which is [adv] difficult [verb] | 19 |
|
| 5 | which it is [adv] difficult | 11 |
|
