元音字母O的字母组合主要有以下几种：

（1）元音字母O与其他元音字母（A，E， I， U）组合，构成oa, oi,ou,其中oa读[əʊt]

oa, oa, oa, oa is for oat.[əʊt].





















oa, oa, oa, oa is for boat.[bəʊt]

oa, oa, oa, oa is for goat.[gəʊt]

oa, oa, oa, oa is for load.[ləʊd]

oa, oa, oa, oa is for toad.[təʊd]

oa, oa, oa, oa is for soap.[səʊp]

oi读作[ɔɪ],通常出现在音节的中间位置。

oi, oi, oi, oi is for hoist.[hɔɪst]

oi, oi, oi, oi is for noise.[nɔɪz]

oi, oi, oi, oi is for ˈboisterous.[ˈbɔɪstərəs]

ou在重读音节中读作[aʊ],[u:]或[ʌ]。

ou, ou, ou, ou is for about.[əˈbaʊt]

ou, ou, ou, ou is for loud.[laʊd]

ou, ou, ou,ou is for house.[haʊs]

ou, ou, ou, ou is for mouse.[maʊs]

ou, ou, ou, ou is for soup.[su:p]

ou, ou, ou, ou is for group.[gru:p]

ou, ou, ou, ou is for cousin.[ˈkʌzn]

ou, ou, ou, ou is for double.[ˈdʌbl]

ou, ou, ou, ou is for touch.[tʌtʃ]

ou, ou, ou, ou is for trouble.[ˈtrʌbl]

ou在非重读音节中读作[ə]。

ou, ou, ou, ou is for famous.[ˈfeɪməs]

ou, ou, ou, ou is for moustache.[məˈstɑ:ʃ]

(2)元音字母o 与半元音字母（r, y, w）可以组合成or, oy, 和ow.

其中or在重读音节中读作[ɔ:]

or, or, or, or is for or.[ɔ:]

or, or, or, or is for for.[fɔ:] 

or, or, or, or is for sort.[sɔ:t] 

or, or, or, or is for torch.[tɔ:tʃ]

or, or, or, or is for scorn.[skɔ:n]

or在[w]之后的重读音节中读作[ɜ:]

or, or, or, or is for word.[wɜ:d]

or, or, or, or is for work.[wɜ:k]

or, or, or, or is for worm.[wɜ:m]

or, or, or, or is for worth.[wɜ:θ]

or在非重读音节中读作[ə]。

or, or, or, or is for actor.[ˈækt]

or, or, or, or is for doctor.[ˈdɒktə]

or, or, or, or is for effort.[ˈefət]

or, or, or, or is for forget.[fəˈget]

其中oy读作[ɔɪ]，通常出现在音节的结尾处。

oy, oy, oy, oy is for boy.

oy, oy, oy, oy is for toy.

oy, oy, oy, oy is for joy.

ow在音节中读作[aʊ]或[əu].

ow, ow, ow, ow is for allow.[əˈlaʊ]

ow, ow, ow, ow is for how.[haʊ]

ow, ow, ow, ow is for now.[naʊ]

ow, ow, ow, ow is for endow.[ɪnˈdaʊ]

ow, ow, ow, ow is for brown.[braʊn]

ow, ow, ow, ow is for clown.[klaʊn]

ow, ow, ow, ow is for down.[daʊn]

ow, ow, ow, ow is for gown.[gaʊn]

ow, ow, ow, ow is for bow.

ow, ow, ow, ow is for low.

ow, ow, ow, ow is for row

ow, ow, ow, ow is for know.

ow, ow, ow, ow is for snow.

ow, ow, ow, ow is for yellow.

ow, ow, ow, ow is for sparrow.

(3) 元音字母O与其它元音字母以及半元音字母组合，形成oar, ore, oor, our。

其中oar 和oor在重读音节中读作[ɔ:]

oar, oar, oar, oar is for oar.[ɔ:]

oar, oar, oar, oar is for boar.[bɔ:]

oar, oar, oar, oar is for coarse.[kɔ:s]

oar, oar, oar, oar is for roar.[rɔ:]

oar, oar, oar, oar is for soar.[sɔ:]

oor, oor, oor, oor is for door.[dɔ:]

oor, oor, oor, oor is for floor.[flɔ:]

oor, oor, oor, oor is for moor.[mɔ:]

ore组合在重读音节中读作[ɔ:]

ore, ore, ore, ore is for bore.[bɔ:]

ore, ore, ore, ore is for core.[kɔ:]

ore, ore, ore, ore is for more.[mɔ:]

ore, ore, ore, ore is for pore.[pɔ:]

ore, ore, ore, ore is for store.[stɔ:]

ore, ore, ore, ore is for shore.[ʃɔ:]

our 组合在重读音节中读作[ɔ:], [auə]或[ə:]。

our, our, our, our is for course.[kɔ:s]

our, our, our, our is for four.[fɔ:]

our, our, our, our is for pour.[pɔ:]

our, our, our, our is for mourn.[mɔ:n]

our, our, our, our is for your.[jɔ:]

our, our, our, our is for our.[auə]

our, our, our, our is for hour.[hauə]

our, our, our, our is for flour.[flauə]

our, our, our, our is for sour.[sauə]

our, our, our, our is for aˈdjourn.[əˈdʒɜ:n]

our, our, our, our is for ˈcourtesy.[ˈkɜ:təsi]

our, our, our, our is for ˈjournal.[ˈdʒɜ:nl]

our, our, our, our is for ˈjourney.[ˈdʒɜ:ni]

字母组合our 在非重读音节中读作[ə]

our, our, our, our is for 'harbour. ['hɑ:bə(r)]

our, our, our, our is for 'neighbour.['neɪbə]