what is the correct way to use the phrase "delam mikhad"?
my friend used this phrase recently, and I want to understand it better

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I like to  ,  I want to  ,  I love to  = delam mikhad (means dost daram )

i like to learn english = delam mikhad englesi ra yad bigiram

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When you like to do sth---> Delam mikhad ye livan chaee bekhoram ( I like to drink a glass of tea) 
There is another usage of this phrase here: For example someone asks you : Chera dari inkaro mikoni?( Why are you doing this?) 
You reply: inkaro mikonam chon delam mikhad (I am doing this, because I want to/I like to do it) 
(This usage is a bit rudely)

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If your friend used this sentence to answer a question started with "Why do you ...?"
It means "because the sky is high"

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OMG I put it in comment box again!!

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When you like to do sth---> Delam mikhad ye livan chaee bekhoram ( I like to drink a glass of tea)

There is another usage of this phrase here: 
For example someone asks you : 
Chera dari inkaro mikoni?( Why are you doing this?)
You reply: inkaro mikonam chon delam mikhad (I am doing this, because I want to/I like to do it)
(This usage is a bit rudely)