以下是20个主语从句的例子及其翻译：
What he said was true.
他所说的是真的。Whether we will go for a picnic depends on the weather.
我们是否去野餐取决于天气。That she is so clever surprises us all.
她如此聪明让我们所有人都感到惊讶。Who will be our new teacher hasn't been decided yet.
谁将成为我们的新老师还没有决定。How this happened remains a mystery.
这件事是如何发生的仍然是个谜。When they will arrive has not been announced.
他们何时到达尚未宣布。Why he did it is unclear.
他为什么这么做还不清楚。Which book you should read first doesn't matter much.
你先读哪本书并不重要。Where he lives is a secret.
他住在哪里是个秘密。Whether the plan is feasible needs further discussion.
该计划是否可行需要进一步讨论。That I am late is my fault.
我迟到了是我的错。How long we will stay here depends on your decision.
我们将在这里待多久取决于你的决定。What he wants to do next is unknown.
他接下来想做什么还不知道。Whether she will come or not doesn't affect the meeting.
她来与不来都不会影响会议。That he is honest is beyond doubt.
他的诚实是毋庸置疑的。Why she left suddenly is still a puzzle.
她为何突然离开仍是一个谜。Which way to choose is up to you.
选择哪条路取决于你。How much money he has is none of our business.
他有多少钱不关我们的事。Whether the experiment will succeed remains to be seen.
实验是否会成功还有待观察。That they have finished the work ahead of time is amazing.
他们提前完成了工作是令人惊奇的。
这些例子展示了主语从句在英语句子中的多种用法，包括描述事实、表达疑问、提供建议等。希望这些例句和翻译能帮助您更好地理解和运用主语从句。
