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英语中,动词变成过去式,什么情况下ed发音发/t/

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英语中,动词变成过去式,什么情况下ed发音发/t/
英语中,动词变成过去式,什么情况下ed发音发/t/
-ed的发音规则:
1、ed在清辅音/p/,/tʃ/,/k/,/ʃ/,/s/等后发清辅音/t/,如:
helped/helpt/;
stopped/stɔpt/;
watched/wɔtʃt/
reached/ri:tʃt/
cooked/kukt/
worked/wə:kt/
washed/wɔʃt/
finished/finiʃt/
passed/pa:st/
fixed/fikst/;   
2、ed在浊辅音/g/,/v/,/z/,/l/,/m/,/n/等后发浊辅音/d/,如:  
begged/begd/;
legged/legd/;
moved/mu:vd/;
lived/li:vd/;pleased/
pli:zd/;
closed/kləuzd/;
called/kɔ:ld/;
smiled/smaild/;
seemed/si:md/;
screamed/skri:md/;
cleaned/kli:nd/;
happened/hapənd/;   
3、ed在原音后发浊辅音/d/,如:
played/pleid/;
prepared/priˈpɛəd/;
employed/imˈplɔid/;   
4、ed在/t/,/d/后常发/id/,如:
painted/peintid/;
started/stɑ:tid/;
decided/diˈsaidid/;
visited/visitid/.