when your in love, 你 can't stop thinking about that person, 你 can't imagine yourself with anyone else, when your see them your filled with happiness, 或者 even if 你 hear 或者 see their name~ 你 always want the best for a person, your willing to do anything for that person.
When your in love, 你 just know, it's nearly impossible to explain.
你 want to make this person happy. 你 feel happier than you've ever felt when around them. 你 think about them a LOT. Like all the time. They are your favourite person in the world. You're always smiling whn around them, talking to them and thinking about them- without even realising. Whenever 你 sit near them 你 just want to sit closer until you're touching, then 你 just want to cuddle them. When 你 hear them compliment 你 你 get this incredible rush of happiness. 你 feel slightly jealous when 你 see them talking to other people, especially people of your gender. They 爱情 你 back (not essential, but it helps)
I can think of more, but this is all I have time for at the moment.
If whenever he looks at 你 或者 你 look at him, 你 feel like floating. If whenever 你 are sad and he comforts you, 你 feel like 你 are on 云, 云计算 9. If everytime 你 are near him, he makes 你 feel special. If 你 get Butterflys just 由 looking at him.
(ーー;)Does it look like I care? ._. Besides, isn't there something called 'Google'? When 你 have over 5,000 答案 there, why would 你 ask it here, where you'll probably get about 50, and half of them are jokes/unhelpful. (i.e my answer. :P)