| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | how difficult it be for | 25 |
|
| 2 | how difficult it [be] for | 25 |
|
| 3 | how difficult it [be] for | 25 |
|
| 4 | how difficult it [be] for | 25 |
|
| 5 | how difficult it [is] for | 17 |
|
| 6 | how difficult it is for | 17 |
|
| 7 | how difficult it [was/were] for | 8 |
|
| 8 | how difficult it was for | 8 |
|
