English - Hanzi	Pinyin	Phonetics	Sound
of - 得	dé / de / děi	duh / duh / day
of - 的	de	duh
of course - 当然	dāngrán	dahng-ran
often - 常	cháng	chahng
often - 常常	chángcháng	chahng-chahng
often - 经常	jīngcháng	jeeng-chahng
oh my! - 啊呀	āyā	eye:ah
oil; fuel - 油	yóu	yoh
OK/good? - 好吗	hǎoma	how-mah
OK; to go; to travel / line; company; business; to walk - 行	xíng / háng	tsee:en / hahng
old - 老	lǎo	laowe
old friend - 老朋友	lǎopéngyou	laowe-pung-yo
old person - 老人	lǎorén	laowe-rhuhn
older brother - 哥哥	gēge	geuh-geuh
older sister - 姐姐	jiějie	jee:eh-jee:eh
oldest brother - 大哥	dàgē	dah-geuh
one - 一	yī	ee
one of - 一个	yīgè	ee-guh
oneself; one's own; personal/self - 己	jǐ	djee
only - 只有	zhǐyǒu	djeuh-yo
open - 开	kāi	kye
open up (to) - 张	zhāng	djahng
or - 或	huò	hoo:awh
or - 还是	háishi	hye-sheuh
or; specialist - 者	zhě	jawh:ah
or; specialist - 或者	huòzhě	hooh:ah-jawh:ah
orange tree - 橙	chéng	cheung
ordinal number - 号	hào	howe
ordinary - 便	biàn	bee:eun
our; ours - 我们的	wǒmende	wahw-men-duh
out - 外	wài	wehy
outside - 外边	wàibian	way-bee:eun