We have identified a problem with our expense sheet, but we will solve it.
A person is convinced of something, believes firmly in it, and has no doubts about it. If you're not sure about something, you don't have specific knowledge about it. She is absolutely sure that she will succeed in the world. You believe or identify a person who is not specifically named that particular person. A safe example is when you are sure you let your dog in early.
An example of the positive is a good attitude. An example of a positive person is a motivational speaker. A friend who is confident that the Oakland A won the World Series is a good example. A person infected with HIV is an example of an HIV-positive person. Being pretty certain also means being pretty uncertain. That means I have some doubts. My belief is that we should always be at least fairly insecure and partially open-minded.
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