Many people confuse these words. It’s not really difficult though – practice is a noun and practise is a verb. For example:
- My father retired from legal practice in August 2008.
- Do I have to go to netball practice tonight?
- Making model aeroplanes is a somewhat nerdy practice.*
Contrast the above uses of practice with the following:
- My father practised law for over 45 years.
- I want you girls to practise shooting baskets.
- Practising making model aeroplanes is nerdy too.
A few other word pairs operate the same way, such as licence and license, and advice and advise.
* I know – I still have most of the plastic planes I made in the 70s.