1. 一般观在时
1. 一般观在时⑴构成主要用动词原形，第三人称单数谓语动词用第三人称形式⑵用法①经常性习惯性的动作或存在的状态，常与often, sometimes, usually, once a week, every year表示频率的副词和时间状语。I often take a bus to School.②客观事实和普遍真理The earth is round③ 主句为一般将来时，If, as soon as, until, till, when 引导的时间和条件状语从句，从句用现在时表示将来。When I grow up, I will go to America④ 某些以here, there 开头的句中，一般现在时表示正在发生的动作。There goes the bell (3) 与一般现在时连用的时间状语① 频度副词often, sometimes, usually,sometimes② 时间状语once a week, twice a month③时间状语everyday, every morning, every year 2. 一般现在时的用法①过去时间发生的动作或存在的状态We visited a farm last week②过去习惯或经常发生性的动作When I was in the countryside, I used to swim in the river,③与一般过去时连用的时间状语Yesterday, last week, last night, some years ago, in 1990, in the past, the other day, at that time, just now.
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