g
Sounds similar to "g" as in "go", but voiceless. Strictly speaking, it is more like the unaspirated "k" in words like "skate".
gāo
tall
高
gēge
older brother
哥哥
k
Sounds like "k" as in "kite".
kàn
to see
看
kěyǐ
can
可以
ou
Sounds like "o" as in "oh" or "bone".
tóu
head
头
búgòu
not enough
不够
u w
Sounds like "oo" as in "too".
wǔ
five
五
yīfu
clothes
衣服
wèn
to ask
问
hūnyīn
marriage
婚姻
o
Similar to the "o" sound in English like in "bone", but is a pure vowel. (English "o" is a diphthong of "o" and "u".)
pò
broken
破
guó
country
国
Single-syllable audio courtesy of the AllSet Learning Chinese Pronunciation Wiki, used with permission.
HSK word audio courtesy of Audio-cmn. (CC BY-SA 3.0)