A1 in a good way: I thought they played well. He’s doing well at school.
A2 in a complete way or as much as possible: I know him quite well.
well done! A1 used to tell someone how pleased you are about their success: ‘I passed my exams.’ ‘Well done!’
as well A1 also: Are you going to invite Steve as well?
as well as something A1 in addition to something: They have lived in the United States as well as Britain.
oh well B1 used to say that a situation cannot be changed although it might be disappointing: Oh well, you’ll have plenty of other chances to find a job.
all is well B1 everything is in a good or acceptable state: I hope all is well with Zack.
may/might as well › used to say that it is better to do something, even though it is not a lot better: It’s not raining, so we might as well walk there.