在复习从句时,特别要理清时态在从句中的用法,如状语从句(这里主要谈时间状语从句和条件状语从句)时态的用法是,当主句是一般现在时、一般将来时、祈使句时,从句要用现在时。当主句是过去时时,从句则要用过去时态。如:
①I won't take part in the party if I'm not invited.
②When the weather is fine , many families go out for a walk .
③All the students went out when the bell rang.
而since 引导的从句比较特殊,它的主句一般用现在完成时或一般现在时,从句则用一般过去时。如:
①It is 3 years since I came to the company. ②I have known him since I came to middle school.
宾语从句时态的用法则是当主句是一般现在时时,从句的时态可根据从句的时间状语来选择任意时态。当主句是过去时时,从句则只能用过去时态的某一种(客观真理等则只能用一般现在时)。如:
①I can't remember if I have seen him before.
②Betty thought that trees improved the air.
在复习宾语从句和状语从句时,还要掌握准确判断宾语从句与状语从句的方法。例如:①I want to know if the final exam will come in June?
②I'm sure I will pass the listening test next month if I practice it carefully.
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