1. This is Jack's book. /ks/
2. This is Jat's book. /ts/
3. This is Jass's book./siz/
4. This is Jaz's book./ziz/
5. This is my teacher's book./z/
6. These are our teachers' books./z/
How to pronunce those red parts?
Now I read them as /ks/, /ts/, /siz/, /ziz/, /z/, /z/.
Am I right? Yes, you are
I doubt these because I often hear "'s" is pronunced as "/s/", even in the 5th and the 6th sentence. ( I think in the last two sentences, it should be pronunced as /z/)
So, are there any rules?
Where do you here the /s/ sound? I don't hear it here in the UK.