[header] How to stop finishing other people's sentences [title] Enlist help. [step] If you know that you have a serious problem finishing other people's sentences, ask your family and friends for help. Let them know you realize that you do this and ask them to tell you when you've interrupted conversations. 
This may make you more aware of your behavior and help you to slowly stop finishing other people's sentences. [substeps] Remember that family and friends are happy to help and don't mean anything bad by telling you that you finish other people's sentences.