First, read the English article below.

You don't want to step on someone else’s toes by trying to get an already taken guy to confess his feelings for you. Also, you don't want to get your hopes up about a guy who is hung up on someone else they may be pursuing. It won't take too much effort to find out what the situation is. All you need to do is a little digging around among friends, social media, or simply asking him questions. Here are some questions you can ask to find out:  If you have the courage, ask him during one of your regular conversations if he is already seeing someone. Casually ask, "Are you dating anyone?" or "Is there currently someone you're pursuing?". Simply asking won't give away any of your feelings. If you can't ask him, either because you are too shy or you don't see him often, try asking one of his friends what they might know. Bring him up in a conversation and ask, "Do you know if he is dating someone?". If you can't ask anyone, check to see if he has his relationship status posted on Facebook or another social media outlet. If you discover that he is single, then you should try to find out what his feelings are about relationships. This will allow you to see if you two are on the same page about dating. Be subtle and try to get some one on one time together that is just between the two of you. Here are some questions you can ask him to help open up a conversation about dating:  "When was your last relationship?" "Are you interested in dating?" "Do you go on dates often?" During your interactions, try to always create pleasant and fun conversation that will allow you to see if he wants to joke around with you. You might even want to gently poke his shoulder during conversation to see how he reacts. If he laughs and teases you back, that is a good sign. Humor is a good way to open a heart that is leaning towards you because it shows you are interested which makes the guy more comfortable.  When he tells a joke, make sure you laugh. This will boost his confidence and give him the green light to share his feelings with... 

Now, please write a short abstract for it in Chinese. Abstract:
确定他没有女朋友。 弄清他对男女关系和恋爱的看法。 制造轻松愉快的气氛。 留意你们之间可能出现的化学反应。