When should we use "take it for granted"?

i have heard it in English movie but dont know the situation that when do they speak. or:i have heard it in English movie but don't know the situation

i have heard it in English movie but don't know the situation that when do they speak.

or:i have heard it in English movie but don't know the situation that when do they speak.

or:It almost means \"it is therefore true that...\". For instance, if someone who gets drunk every night is phoned at 10pm you can \"take it for granted\" that they will be drunk when you call.

or:I guess the movies you've watch are categorized as adult movie. So, adult usually means the idiom as \"to use, accept, or treat in a careless or indifferent manner\"Example: A marriage can be headed for trouble if either spouse begins to take the other for granted.

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