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名词变复数s的发音规则
一般情况下
1.在清辅音后，如books [buks]
2.在浊辅音和元音后发[z]，如pigs [pigz], trees [tri:z]
3.在t,d后与前面的[t],[d]连起来一起读[ts]，[dz],如cats [kæts]，beds [bedz]
清辅音共12个：[p] [t] [k] [f] [s] [θ] [ʃ] [ts] [tr ] [tʃ] [h] [r]
浊辅音共16个：[b] [d] [g] [v] [z] [ð] [ʒ] [dz] [dr] [dʒ] [ l ] [m] [n] [ ŋ ] [ j ] [w]
4.以辅音字母s, sh, ch, x结尾的名词，在词尾加-es, 发[iz]，所以在[s], [z], [ʃ], [ʒ], [dʒ],[tʃ]后发[iz]
如buses[bʌsiz], blouses ['blauziz], boxes[bɔksiz] , dishes [diʃiz], bridges[bridʒiz], watches[wɔtʃiz]
读出s的读音。

days
ties
hands
peaches
boxes
leaf-leaves
thief-thieves
keys
knife-knives
cups
dresses
dishes
faxes
bands
blouses
hero-heroes
potato-potatoes books
hats
suits
dogs
bags
buses
classes
shelf-shelves
zoo-zoos
photo-photos tobacco-tobaccos fishes
wife-wives
kilo-kilos
housewife-housewives factory-factories watches
boy-boys
toys
baby-babies
days
piano-pianos
army-armies
story-stories
radio-radios
tomato-tomatoes
规则动词过去式加ed后的发音规则
1.在清辅音后面[t]，如：helped [helpt], passed [pɑ:st]
2.在浊辅音和元音后面[d]，如：borrowed['bɔrəud]，moved[mu:vd]
3.在[t]、[d]音后面[id]，如：wanted['wɔntid]，started[stɑ:tid]，needed [ni:did]，counted [kaʊntid]。