How to Know if a Girl Likes You?

Easy. Don't ask. Just open your eyes.
ACTION speaks louder than words. Don't wait for words, look for ACTION.
You just have to look for positive signs, or buying signals. If:
-she brushes up against you
-she laughs when you say something (even when it's not funny!)
-she gives you a compliment
-she's turning red when you talk to her
-she gets nervous when you're around
-she's nervous while talking to you
-she's playing with something (pen, bracelet, necklace...)
-she's twirling her hair
-she fingers hers lips
-she didn't mention to you she had a boyfriend, but she did with others
-she's checking in the conversation if you have a girlfriend
-she reveals her feelings, and say: just kidding
-she tries to be with you
-she offers you something
-she tries to be more beautiful (hairdresser, new clothes, lipstick, perfume...)
-she fakes jealousy for fun
-she invites you indirectly or if she suggests any activity
-she likes to borrow your jumper, your jacket, your pen, your cap...
-she asks you for help when she could ask somebody else
-she likes your firstname and likes to pronounce it
-she's asking for help
-she wants to be with you
-she wants to hear your voice
-she likes to be close to you or in your space
-she's usually looking at you
-she's looking at you when leaving a room