Question

只有“宾语从句”才注意“时态问题”吗

Answer 1

所有的名词性从句（主语从句、表语从句、宾语从句、同位语从句）都要考虑时态的问题,如：
It was true that they were true sisters.
The problem was that whom we could get to replace her.
I said that I was very unhappy.
It was a question how he had done it.
当从句为客观真理的时候,时态不变.
The teacher told us that the earth moves around the sun.
It was true that water freezes at thirty-two degrees Fahrenheit.
希望我能帮助你解疑释惑.

Answer 2

不是的，that从句用形式主语和宾语只是一般情况，特殊的比如说，it
is
uncertain
whether
the
experiment
is
worth
doing,其中，it就是做形式主语，儿此从句是由、whether引导的。