If you are sure that something is true, you are certain that it is true. If you are not sure about something, you do not know for certain what the true situation is.

If someone is sure of getting something, they will definitely get it or they think they will definitely get it.

If you say that something is sure to happen, you are emphasizing your belief that it will happen.

Sure is used to emphasize that something such as a sign or ability is reliable or accurate.

If you tell someone to be sure to do something, you mean that they must not forget to do it.

Sure is an informal way of saying 'yes' or 'all right'.

You can use sure in order to emphasize what you are saying.

You say sure enough, especially when telling a story, to confirm that something was really true or was actually happening.

If you say that something is for sure or that you know it for sure, you mean that it is definitely true.

If you make sure that something is done, you take action so that it is done.

If you make sure that something is the way that you want or expect it to be, you check that it is that way.

If you say that something is a sure thing, you mean that you are certain that it will happen or be successful.

You say 'sure thing' to show that you agree with someone or will do as they say.

You use to be sure when you are admitting that something is true, although it seems to contradict a more general statement that you are making.

If you are sure of yourself, you are very confident about your own abilities or opinions.