牛津实用英语语法 175形式
A规则动词的过去式是在动词原形后加 ed构成的: 动词原形:work 过去式:worked 以e结尾的动词只加d: 动词原形:love 过去式: loved 对所有人称,均无词形变化: I worked you worked he worked等 规则和不规则动词的否定式均由 did not/didn’ t+动词原形构成: I did not/didn’t work you did not/didn’t work等 疑问式则均由 did+主语+动词原形构成: did I work? did you work?等 否定疑问式: did you not/didn’t you work?等 B拼写注意事项 加ing时最后一个辅音字母双写的规则(参见第165节)也适用于加ed的场合: admit,admitted stop, stopped travel,travelled 以y结尾的动词,y前为辅音字母时,在加ed之前要把y变为i: carry, carried try, tried 但y前面是元音字母时则不变: obey, obeyed |