Re: To the boys:
LOL..
When she asks "Are you married/taken? directly… or indirectly like “She must be a very lucky person who you have in your life!”
When she brings nice meal to you at work and says : “Main Ne Banaya Hai!” ( In other words: Main Aap Ko Ulloo Banaa Rahi Hoon, it was made by my mother actually.." ) 
When she giggles every time you say something.
When she she comes to you for something not important and just tries to find the way to get close to you.
When she says " I have no life" meaning… “Take me out! Gosh! take me out!”
When she says, my mother wants to get me married to a loser… In other words: I do not think you are a loser. 
When she says: “I had a dream about you…but I cannot tell” :Giggles:
Can come up with more:
But nothing beats than… when she comes and says " I like you". At least then you have all the right to assume! Can’t still be sure though!