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If you want to get to know someone better, strike up a lighthearted conversation by asking the person casual questions, like “Do you have any pets?” or “What do you like to do after work?” As you talk to the person, pay attention to what they get excited about when they talk, and ask them more questions about that. Talk to the person a little each time you see them, and as they become more comfortable around you, invite them to hang out with you more often.
Video: How to Get to Know Someone Better - wikiHow