小学英语语法大全-时态一、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 with her moth