Respectful debate
It’s normal to interrupt occasionally in a discussion, but this should not be done too often. You should try to avoid talking over others. Even if you think other people are wrong you should value their contribution. To do this, you can use expressions like 'I can see your point but...' and 'I'm not sure I agree because...'.
You should also think about the kind of language you are using. You might speak differently with a group of friends than you would when discussing with teachers or parents.
Speak clearly and audibly
The other people in the group need to be able to hear you and understand what you are saying. You should avoid mumbling or looking downwards when talking. Try to look up and use a voice that will carry across the group but you should not be shouting.