For example: here, dear, clear. I sometimes hear American people when saying those words, the words come out from deep into their throats. But, still, I don't know how to do it.
Notice to pronounce the words "here", " dear" and " clear"in American English, you need to make /iy/ sound. In order to make this sound ,set your lips 3/8 inch (1cm) apart.Widen your lips into a big smile. The sound is long. Count to two silently to be sure it is long enough.
Now I would also like to discuss /eə/ sound because I wanted you to compare them and see how they differ.
To make this sound, keep your jaw halfway open. The lips are 1/2 inch (1.3cm) apart. Tense your lips, and form a wide, downward smile. Begin the sound, then move your lips close together into the /ə/ position.
You can practice saying the following words, which feature this vowel sound:
Now Compare ear /iy/, /ɪ/ with
Note: In /ɪəʳ/ as in "Near", the r is not pronounced in BrE, unless the sound comes before a vowel (as in dearest, dear Ann). In AmE, the r is always pronounced, and the sound is often written as /ɪr/.