主句与宾语从句的时态,应该呼应,但不必强求一致,要根据句子的意思来定.
1.如果主句是一般过去时,宾语从句的内容是客观真理,则从句用一般现在时.例如 Our teacher told us yesterday that the moon goes around the earth.
2.如果主句是一般现在时,而宾语从句的内容是讲过去的事,就用一般过去时.例如 I think I was wrong to say that.
更详细的规则,请参见《英语实用语法大全》130页.如需要此书,请发邮件至：zhoushihong_cool@163.com.