English definition of “if”
DEPEND › used to say that something will happen only after something else happens or is true: We'll have the party in the garden if the weather's good. If you eat up all your dinner you can have some chocolate.
MIGHT › used to talk about something that might happen or be true: I'm sorry if I've offended you. What will we do if this doesn't work?
WHETHER › whether: I wonder if he'll get the job. Have you asked her if she'd like to come?
ALWAYS › used to mean always or every time: If you mention his mother, he always cries.