I've not / I haven't Hi everyone! Maybe that's a stupid question, but... does it sound strange when a foreign person says, "I've not seen that before" instead of "I haven't seen that before"? (no special emphasis on "not" implied) Is there a significant difference between these two contractions? I've read that "I've not" is considered as old-fashioned sometimes - does that mean that I should strictly stick to "I haven't"? Thanks in advance.