| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [Wh adv] difficult it is [verb] | 46 |
|
| 2 | how difficult it is [verb] | 44 |
|
| 3 | [Wh adv] difficult it is [to-vb] | 41 |
|
| 4 | [Wh adv] difficult it is to get | 10 |
|
| 5 | [Wh adv] difficult it is get | 10 |
|
| 6 | [Wh adv] difficult it is [v-ing] | 5 |
|
