Ever means at any time. It is used in questions and negative statements.

You use ever in expressions such as 'did you ever' and 'have you ever' to express surprise or shock at something you have just seen, heard, or experienced, especially when you expect people to agree with you.

You use ever after comparatives and superlatives to emphasize the degree to which something is true or when you are comparing a present situation with the past or the future.

You use ever to indicate that a person is showing a particular quality that is typical of them.

You use ever to say that something happens more all the time.

You can use ever for emphasis after 'never'.

You use ever in questions beginning with words such as 'why', 'when', and 'who' when you want to emphasize your surprise or shock.

If something has been the case ever since a particular time, it has been the case all the time from then until now.

You use ever in the expressions ever such and ever so to emphasize that someone or something has a particular quality, especially when you are expressing enthusiasm or gratitude.

You use the expression all someone ever does when you want to emphasize that they do the same thing all the time, and this annoys you.

You say as ever in order to indicate that something or someone's behaviour is not unusual because it is like that all the time or very often.

You can write 'Yours ever' or 'Ever yours' at the end of a letter before you sign your name, as an affectionate way of ending the letter.