大学英语：在复合句中用作宾语的从句叫做宾语从句。

　　1. 宾语从句常由that引导，在口语中常省略。当主句中谓语动词是现在或将来时态时，从句中谓语动词不受主句中谓语动词时态的影响，按需要可以使用任何时态。如：

　　She says (that) she works from Monday to Friday. 从句是一般现在时

　　She says (that) she will leave a message on his desk. 从句是一般将来时

　　当主句谓语是过去时态，从句中的时态一般用表示过去的某种时态。如：

　　He said there were no classes yesterday afternoon. 从句是一般过去时

　　He said (that) he was going to take care of the baby. 从句是过去将来时

　　He said (that) they were having a meeting at that time. 从句是过去进行时

　　当主句谓语是过去时态，而宾语从句叙述某一客观真理(事实)时，宾语从句的时态则用一般现在时。如：

　　The teacher told us(that) nothing is difficult if you put your heart into it.

　　老师告诉我们世上无难事只怕有心人。

　　He said that light travels much faster than sound. 他说光传播比声音传播快得多。