The a in that is pronounced like the a in the word cat, bat, or mat.
The th is pronounced like the the th in them, there, or those.
The last t in the word that is pronounced like the t in tall, tin, or tack.
The usual pronunciation of I (the pronoun or English letter) is the same as the word (eye). However, the pronoun I is sometimes "extended" as (aye), a long I with a very soft long E on the end,...
It depends on the person. Some say Ay-Tee-Ay-Tee because of other walkers, like the AT-ST, AT-PT and AT-AA. Others say At-At (@-@) because it's more efficient to use just two syllables rather than...
h-OW doo yoo doo make sure that you don't put too much time into stressing each word though. when spoken normally the "do you do" sounds almost like one word