| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | how difficult it be for [pron] | 7 |
|
| 2 | how difficult it [be] for [pron] | 7 |
|
| 3 | how difficult it [be] for [pers pn] | 7 |
|
| 4 | how difficult it [be] for [pron] | 7 |
|
| 5 | how difficult it was for [pron] | 5 |
|
| 6 | how difficult it [was/were] for [pron] | 5 |
|
