发音
上下齿接近闭合
舌端靠近牙龈
声带不震动

单词
sit ski sky
box fix mix
say sea see
cell cent city
face ice nice
smile small sell
stay stop swim
glass class less
some song soon
base case sense

句子
The sky is blue.
Don’t sit on the box.
Please keep smiling.
There are some songs.
The city is covered by snow.

同音
it’s its
sew so
sea see
son sun
sale sail
cent sent
some sum
scene seen
mist missed
past passed

辨音
[s] [z]
rice rise
ice eyes
race rays
base bays
race raise
loose lose
peace peas
place plays
face phase
price prize

[s] [θ]
sin thin
bass bath
pass path
sank thank
sing thing
sink think
sum thumb