One of the most common pronunciation problems for English learners is the difference between /s/ and /z/. These sounds are very similar, but this contrast changes word meaning.
What is the difference?
The /s/ sound is voiceless (no vibration). Put your hand on your throat and say "sssss" (like a snake). You should not feel vibration.
The /z/ sound is voiced (with vibration). Put your hand on your throat and say "zzzzz" (like a bee). You should feel vibration in your fingers.
Minimal Pair: Ice vs Eyes
Listen and practice the contrast. If you do not voice the final /z/ in "eyes," it can sound like "ice."
More Examples
Practice Sentence
Try saying this sentence while keeping the contrast clear:
"The price of the prize was high."