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After listening to someone it's important that both parties talk and express their feelings and opinions about the topic of choice. You can say: "I agree with the point you're making, and I'd like to add..." or "That's an interesting point, however I feel that...".
In order to listen effectively, there are some things to take into consideration: don't interrupt the person talking, listen to their body language, don't jump to conclusions, show that you are listening (maybe some head nods and a smile), ask questions, don't belittle their opinion and paraphrase or summarise what the other person said. All of these tips show that you were listening carefully.
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