/ϑ/ /ð/
mouth /mauϑ/ mouths /mauzð/
thigh /ϑai/ thy /ðai/
ether /'i:ϑə/ either /'aiðə/
bath /bɑ:ϑ/ bathe /beið/
/s/ /ϑ/
sick /sik/ thick /ϑik/
face /feis/ faith /feiϑ/
seem /si:m/ theme /ϑi:m/
mouse /maus/ mouth /mauϑ/

/z/ /ð/
closing /'kləuziŋ/ clothing /'kləuðiŋ/
breeze /bri:z/ breathe /bri:ð/
bays /beiz/ bathe /beið/
zooz /zu:z/ those /ðəuz/
through thick and thin here and there
believe the truth thank you their things
Ruth doesn’t think that “health is wealth” is a truth.
Neither my father nor my mother would withdraw their promises.
They don’t know whether the weather permits though they are planning to hold a get-together.
He has a big mouth.