| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | how difficult it [be] [prep] | 31 |
|
| 2 | how difficult it be [prep] | 31 |
|
| 3 | how difficult it [be] [prep] | 31 |
|
| 4 | how difficult it [be] [prep] | 31 |
|
| 5 | how difficult it [be] for | 25 |
|
| 6 | how difficult it [be] for | 25 |
|
| 7 | how difficult it [is] [prep] | 21 |
|
| 8 | how difficult it is [prep] | 21 |
|
| 9 | how difficult it [was/were] [prep] | 10 |
|
| 10 | how difficult it was [prep] | 10 |
|
