We run the word "to" into the following word or syllable, dropping the vowel oo. Listen to the examples below.
We shorten the word the and run it onto the following word when the word after "the" is stressed. We use vowel schwa on this word in most contexts, not vowel ee (the = thuh, not thee). You can hear this in the recording below.
We reduce the word are and tack it on to the previous word in some cases. It sounds more like a short vowel er. Listen to the recording below.