| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | difficult it is [verb] | 69 |
|
| 2 | difficult it is [to-vb] | 63 |
|
| 3 | difficult it is get | 10 |
|
| 4 | difficult it is to get | 10 |
|
| 5 | difficult it is [v-ing] | 6 |
|
