上海牛津小学英语语法知识总结一般现在时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 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 wit
