主句是一般现在时,从句根据实际情况使用任何时态。 例句:the headmaster hopes everything goes well. 主句是一般过去时,从句须用过去时态的某种形式。 例句:she was sorry that she hadn’t finished her work on time. 当宾语从句表示的是一个客观真理或者事实真理时,即使主句是过去时,从句也用一般现在时态。 例句:the teacher told his class that light travels faster than sound.