| 1 | I'm not sure what will happen next. | |
| 2 | I'm not sure of his ability to cope with this. | |
| 3 | The future is so uncertain that one man's guess is as good as another's. | |
| 4 | I still had trepidations about their ability to maintain security. | |
| 5 | Little did I know of how spirited the give-and-take was about to become. |