1. I'm (not old enough) to watch X-rated films. You have to be eighteen.
2. I don't go to the cinema much - tickets are (too expensive).
3. I'm (not confident enough) to perform on the stage.
4. I'm (not old enough to) remember music from the 1990s!
5. I'm (too impatient) to learn a musical instrument.
6. I don't download films. My lnternet connection is (not fast enough).