不是
1·主句用一般过去时时,从句要用过去时态中的一种。
2·当从句是客观真理、谚语、格言时,无论主句是何种时态,从句都使用一般现在时。
eg.1.He said the earth is round.【真理】
2.My grandma told me where there is a will there is a way,when I was young.【谚语】
不一定的
I killed her because I love her.
已经杀了,killed
但直到现在还爱他,love
一般是要保持一致的。
She said that she was a student.
I left the room when school was over.