(1) 如果主句是一般现在时，宾语从句根据实际情况用各种时态。My teacher says he will be back in a week. （一般将来时）My teacher says he is watching TV. （现在进行时）My teacher says he has seen the movie. （现在完成时）
(2）如果主句是一般过去时，宾语从句用相应的过去时态。My father said he was watching TV at that time.（过去进行时）My father said the he had already seen the movie. （过去完成时）注意：如果宾语从句是表示客观真理和规律的句子时，用一般现在时。Our teacher told us the sun is much bigger than the earth. （一般现在时）
