Use little words to soften your statements:
Break down negative sentences with some softeners.
Don't say: I don't like it
Say: I don't really like it I'm afraid
Don't say: Can I say something?
Say: Can I just say something here?
Avoid 'finger pointing' statements with the word 'you'
This is aggressive and too direct. Try to avoid saying 'you' and put the focus on 'I' or 'we'.
Don't say: You don't understand me.
Say: Perhaps I'm not making myself clear.
Don't say:You didn't explain this point.
Say: I didn't understand this point.