Problems using a conditional
I would like to know how to say to somebody that if he or she prefer something I "would" do it. I don´t know if in the second clause I have to use "would", "could" or "can". For example in spanish: "Si lo prefieres podríamos ir al cine"

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Answer

You'd probably use either a zero conditional:
'If you prefer, we can go to the cinema.'

or a mixed conditional:
'If you prefer, we could go to the cinema.'

The meaning is the same, but the second is more tentative.

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The meanings are very similar in English and Spanish:  iría = would go ;  podría ir  =  could go ;  puede ir = can go.   Your sentence, translated literally, would be:  "Si lo prefieres podríamos ir al cine" =  If you prefer, we could go to the movies, which would make perfect sense in English.

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A more colloquial way to say it (in America) : If you'd like, we can go to the movies./ If you want to go to the movies, we can.