双元音音素由两个元音组成,发音时由一个元音向另一个元音滑动,口型有变化.前一个元音发音清晰响亮,且时间长；后一个元音发音模糊软弱,且时间短.特别要注意的三点是：
(1)不要将前后两个音断开,应连贯成为一个整体：
(2)不要因为后一个元音发音短小而将其忽略；
(3)发音时滑动过程要完整,时间要充分.
1.双元音 /ei/ May pay way day same hay great gain pain spade
a /ei/ save,face,pale
ay /ei/ day,pay,may
ai /ei/ wait,fail,strait
ea /ei/ break,great
2.双元音 /əu/ no go so hole hope road home slow load foe soul
o /əu/ go,hello,no,open,over,joking,October
oa /əu/ coat,soap,boat,road,coast
ow /əu/ snow,throw,blow,show,know,window
3.双元音 /ai/ bye lie try eye cry die my five time mine like
开音节中的i /ai/ time,crime,rite,fine
igh /ai/ high,might,night,light,bright
y /ai/ cry,my,sky,fly,July,reply
ie /ai/ eye,dye,bye
4.双元音 /au/ how now cow out mouse down house brown found
ou /au/ about,around,found,sound,mouse
ow /au/ down,crowd,town,brown,now,how
5.双元音 /כi/ boy joy toy voice noise join coin oil soil toil
oi /כi/ oil,boil,join,coin,spoilt,voice,choice,noise
oy /כi/ toy,boy,enjoy,destroy,annoy,loyal,employer
6.双元音 /iə/ ear here fear hear dear pier tear near really idea
ear /iə/ ear,dear,hear,clear,beard
ea /iə/ idea,real,theatre
ere /iə/ here,mere,severe
eer /iə/ beer,queer,engineer
7.双元音 /eə/ care wear hair there fair careful various
are /eə/ care,share,fare,hare,careless
air /eə/ air,fair,chair,repair
8.双元音 /uə/ tour sure poor pure cure tourist
ur /uə/ cure,pure,fury