| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have to [be] sure | 39 |
|
| 2 | have to be sure | 39 |
|
| 3 | had to [be] sure | 18 |
|
| 4 | have to [be] sure | 14 |
|
| 5 | have to [be] sure | 5 |
|
