1、定义:表示经常发生或习惯性的动作、状态。句中通常有usually,often,every day,sometimes,always,at weekends,on Sundays等表示经常性时间的短语。 2、构成: 1)当谓语是be动词时,一般现在时的构成:主语+be动词+其他 如:I am a student. He is Jim‟s father. They are from Japan. 2)当谓语是行为动词时,一般现在时的构成: ①主语(非第三人称单数)+动词原形+其他 如:I often watch TV at the weekends. Mr Green and Mrs Green like collecting stamps. ②主语(第三人称单数)+动词的第三人称单数形式+其他 如:Jim usually visits his grandparents on Sundays. She sometimes goes to the park with her mother. 3、动词三单形式的变化规则: ① 一般情况下,直接加s 如:read-reads,swim-swims ② 以s,x,sh,ch,o结尾,加es 如:wash-washes,watch-watches,do-does ③ 以辅音字母+y结尾,变y为i,再加es 如:study-studies,fly-flies ④ 不规则变化 如:have-has 4、一般现在时的句型转换:
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