规则动词词尾加-ed有三种发音规律:
1、在清辅音后读作[t]。如:asked,helped,watched,stopped;
2、在浊辅音和元音后读作[d]。如:enjoyed,studied,moved,called;
3、在t/d后读作[id]。如:wanted,needed。
不规则动词的过去式大体上归纳有以下:
1、以t结尾的词,过去式与原形相同。如:put—put,let—let,cut—cut,beat—beat;
2、以d结尾的词,把d变成t。如:build—built,lend—lent,send—sent,spend—spent;
3、以n结尾的词,在词后加t。如:mean—meant,burn—burnt,learn—learnt;
4、以ow/aw结尾的词,把ow/aw变成ew。如:blow—blew,draw—drew,know—knew,grow—grew;
5、含有双写字母的词,将双写改为单写,在词尾加t。如:keep—kept,sleep—slept,feel—felt,smell—smelt。
