| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it [be] difficult to imagine | 99 |
|
| 2 | [pron] be difficult to imagine | 99 |
|
| 3 | it [be] difficult to imagine | 99 |
|
| 4 | [pers pn] [be] difficult to imagine | 99 |
|
| 5 | [pron] [is] difficult to imagine | 88 |
|
| 6 | [pron] is difficult to imagine | 78 |
|
| 7 | [pron] was difficult to imagine | 11 |
|
| 8 | [pron] [was/were] difficult to imagine | 11 |
|
| 9 | [pron] 's difficult to imagine | 10 |
|
