| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | hard [prep] be sure | 12 |
|
| 2 | hard [prep] [be] sure | 12 |
|
| 3 | hard [prep] be sure | 12 |
|
| 4 | hard to [be] sure | 12 |
|
| 5 | hard [prep] [be] sure | 12 |
|
