There are a couple of answers to this. One is that a lot of American English speakers leave out the "th" sound when speaking quickly. So it might sound like "izzair".
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Anonymoushow can Americans put their tongue in "z"(is) position and then change to th (there) in such short time.It's easy. Both require the tongue to be in approximately the same place in the mouth, so if you're having a lot of trouble with it, you're doing something wrong with either the 'z' or the 'th'. The tongue just slips down a bit. Relax. Don't tr