For most modern native speakers there is no difference. Some immigrants from Arabic-speaking countries, or Israeli Arabs, pronounce the ע as it "should" be: https://en.m.wikipedia.org/wiki/Voiced_pharyngeal_fricative
It's the first sound in the Arabic word for "eye": http://forvo.com/word/عين/#ar
i tried to translate " i can see that he is poor" because you teach that many sentences accept "can" despite the fact that "can" is not writen in the sentence.Is there some way to know about the diferences.?i apologize for my gramatical or spelling mistakes since my native languaje is spanish.