解读时间和条件状语从句 作者:赫广春 一、时间状语从句 用来表示主句动作发生时间的状语从句是时间状语从句,通常由连词when, before ,after等引导。 1. when意为“当……的时候”,用来表示主句动作和从句动作同时发生,或从句动作发生在主句动作之前。例如: We wanted to go to play football when it began to rain. 2. before 意为“在……之前”,通常表示主句的动作发生在从句动作之前。例如: Don't say anything before you look at the picture. 3. after 意为“在……之后”, 通常表示主句动作发生在从句动作之后。例如: I left the office after I rang him up last Sunday. 二、条件状语从句 条件状语从句通常由连词if引导,意为“如果;假如”。例如: If you fall into the water and can't swim, they may come up to help you. 三、时态的运用 在时间状语从句和条件状语从句中,主句和从句之间的时态要保持一致,具体情况如下: 1. 当主句和从句的谓语动词都是单纯陈述过去的事情时,主句和从句都可用一般过去时。例如: When my father was ten years old, the World Cup was in Sweden. 2. 当主句和从句所表达的动作基本同时发生或表示客观事实时,主句和从句都可以用一般现在时。例如: When they walk, Cody walks. 3. 当主句的谓语动词是want, wish,hope等时,从句通常用一般现在时。例如: Do you want to be a policeman when you grow up? 4. 当主句是一般将来时、一般现在时(包括祈使句和含有情态动词can, may, must等),上述两种情况中状语从句必须用一般现在时。例如: What are you going to do after you leave school? Be careful when you cross the road. You must see the doctor if you are ill. 本文来源:https://www.wddqw.com/doc/b5c7d32bf22d2af90242a8956bec0975f465a40e.html