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名词性从句中,各种类型中主句和从句的时态关系是怎样的,请指教

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名词性从句中,各种类型中主句和从句的时态关系是怎样的,请指教
主从句时态一致原则是指(常在宾语从句中见):

如果主句是一般现在时态或现在完成时态,从句常根据需要选择适当时态.如:The teacher says that  he will go to the Great Wall next  week .He tells us that he had an accident the other day .

如果主句是一般过去时态,从句常用过去的某种时态;但从句如果是客观的真理或事实,仍用一般现在时态表达.如:He said that he would go to visit the Great Wall the next week .  The teacher told us that the sun rises in the east . 

还有主将从现原则,主句将来时,从句用现在时,常在时间状语从句和条件状语从句中见
比方说:If it rains,I will go home