小学英语语法大全12一般现在时

 

　　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 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：
　　肯定句 否定句 一般疑问句及回答
　　They watch TVevery day. They don’t watch TVevery day. —Do they watch TV every day?—Yes, they do. / No, they don’t.
　　She watches TVevery day. She doesn’t watchTV every day. — Does she watch TV every day?—Yes, she does. / No, she doesn’t.