| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] difficult it is [verb] | 67 |
|
| 2 | [adv] [adj] it is [v-ing] | 22 |
|
| 3 | [adv] difficult it be [v-ing] | 8 |
|
| 4 | [adv] difficult it [be] [v-ing] | 8 |
|
| 5 | [adv] difficult it [is] [v-ing] | 7 |
|
| 6 | [adv] difficult [pers pn] is [v-ing] | 6 |
|
| 7 | [adv] difficult [pron] is [v-ing] | 6 |
|
| 8 | [adv] difficult it is [v-ing] | 6 |
|
