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 round ③ 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 America ④ 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,sometimes ② 时间状语once a week, twice a month ③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 week ②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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