1、第12讲 一般现在时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 Jims father. They are from Japan.2）当谓语是行为动词时，一般现在时的构成：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
2、 like collecting stamps.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： 一般情况下，直接加s 如：read-reads，swim-swims 以s，x，sh，ch，o结尾，加es 如：wash-washes，watch-watches，do-does 以辅音字母y结尾，变y为i，再加es 如：study-studies，fly-flies 不规则变化
3、 如：have-has4、一般现在时的句型转换：肯定句否定句一般疑问句及回答They watch TVevery day.They dont watch TVevery day.Do they watch TV every day?Yes, they do. / No, they dont.She watches TVevery day.She doesnt watchTV every day. Does she watch TV every day?Yes, she does. / No, she doesnt.say-saidsing-sangswim-swamtake-took4、一般过去时的句型转换肯定句否定句一般疑问句及回答He watched TV yesterday.He didnt watch TV yesterday. Did he watch TV yesterday?Yes, he did. / No, he didnt.They played games just now.They didnt play games just now. Did they play games just now?Yes, they did. / No, they didnt.
