The 'ih' as in 'sit vowel. To make this sound, the front part of the tongue raises towards the roof of the mouth, ih, while the very tip remains down, lightly touching behind the bottom front teeth, ih. The front part of the tongue also stretches wide, ih, ih. You might also see the corners of the mouth pull back slightly, ih, sit.
Here is the 'ih' as in 'sit' vowel on the right compared with the mouth at rest on the left. And here, with the parts of the mouth drawn in. As with all vowels, the soft palate is raised in the 'ih' as in 'sit' vowel, but more important is the tongue position. Notice the mid-front part of the tongue is raised quite high. The tip of the tongue is still lightly touching the back of the front bottom teeth. Sample words: fix, miss, stick. Sample sentence: The pins are in the big wicker bin. Now you will see this sentence up close and in slow motion, straight on and from an angle, so you can really study how the mouth moves when making this sound.
The: the tongue comes through the teeth to make the TH sound. And the lips come together to make the P. Here is an 'ih' as in 'sit' vowel. The pins - tongue goes up to make the N, and the teeth together to make the Z sound. Are - lips make this R consonant shape. In. And now here I freeze it so you can see the relaxed lips, the corners of the lips pulled slightly out wide, and the tongue position where the tip of the tongue is down behind the bottom teeth, and the front part of the tongue is slightly raised, so you can see it here. Tongue tip up to make the N. The, tongue through the teeth again for the TH. Lips together for the B, big, another 'ih' as in 'sit'. Lips form the W sound, wicker, another 'ih' as in 'sit'. You can see the back of the tongue there has moved up. And bin. Lips together for the B, and the 'ih' as in 'sit' sound. Tongue tip up to make the N. And now from an angle.
The, tongue comes through the teeth. Pins with the ih vowel sound. Tongue goes up to make the N. Are: the lips form this consonant sound and the tongue goes back for it, then comes forward for the 'ih'. In. Up quickly to the N and through the teeth. The big - another 'ih' as in 'sit' vowel. Lips form the W for 'wicker'. Another 'ih' as in 'sit' vowel. And finally, bin with the 'ih' as in 'sit' vowel sound. Tongue moves up to make the N. That's it, and thanks so much for using Rachel's English.