| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | so hard [to-vb] | 165 |
|
| 2 | so hard to get | 13 |
|
| 3 | so hard to make | 7 |
|
| 4 | so hard to keep | 7 |
|
| 5 | so hard to achieve | 7 |
|
| 6 | so hard to do | 6 |
|
| 7 | so hard to understand | 5 |
|
