There is no doubt that+从句

经典句型：There is no doubt that+从句；

There is no doubt/denying that…“毫无疑问／不可否认……”，其中that引导同位语从句。

例如：

There is no doubt at all that we did the right thing.

毫无疑问我们做得对。

There was no doubt he was serious, it wasn’t just playing around

毫无疑问他很认真，那可不是闹着玩的。

There’s no doubt Mr Putin’s speech caught the mood of most deputies.

无疑，普金先生的讲话充分反映了大多数代表的心情。

There is no doubt it was an accident and I bear no grudges.

这无疑是个意外，我没有怨言。

以上3例摘自《柯林斯高阶英汉双解学习词典》

说明that可以省略；

There is no doubt that grades have improved and interest in education has revived.

无疑，成绩提高了，上学的兴趣也恢复了。

《柯林斯高阶英汉双解学习词典》

There is no doubt that some considered that a beating was no more than summary justice

毫无疑问，有人认为拷打比草菅人命好不到哪去。

doubt用作名词时，在肯定句中用whether(不可用if)引导同位语从句；在否定句中用 that引导同位语从句。

There is some doubt whether he will be elected president.

他能否当选总统还有些疑问。