Expressions (phrases, clauses, etc.)apart from that; to return to the topic; enough of that

Expressions (phrases, clauses, etc.)you must be kidding; hey, come on!; surely not!

Expressions (phrases, clauses, etc.)anyway; by the way; incidentally; well; to change the subject

Expressions (phrases, clauses, etc.)why yes, thank you

Expressions (phrases, clauses, etc.)in that case; (might not be what was expected or hoped for but) if that's the case