Ever is used in negative sentences, questions, and comparisons to mean ‘at any time in the past’ or ‘at any time in the future’.
Neither of us had ever skied.
I don't think I'll ever be homesick here.
Have you ever played football?
I'm happier than I've ever been.
Don't use ever in questions or negative sentences to ask whether an expected event has happened, or to say that it has not happened so far. Don't say, for example, ‘Has the taxi arrived ever?’ or ‘The taxi has not arrived ever’. The word you use is yet.
Have you had your lunch yet?
It isn't dark yet.
➜ See yet
Don't use ever in positive sentences to say that there was never a time when something was not true. Don't say, for example, ‘I’ve ever been happy here'. Use always.
She was always in a hurry.
Talking to Harold always cheered her up.
➜ See always
Don't use ever to say that something is continuing to happen. Don't say, for example, ‘When we left, it was ever raining’. Use still.
Unemployment is still falling.
I'm still a student.
➜ See still
If something has been true ever since a particular time, it has been true all the time from then until now.
‘How long have you lived here?’ – ‘Ever since I was married.’
We have been good friends ever since.