竟然, 究竟 and 到底 for Surprise and “What on Earth?”

Pola

subject + 竟然 + verb (surprise); 到底/究竟 + question (pressing)

竟然 says “to my surprise”: the fact is real but unexpected. 到底 and 究竟 go into questions to ask “what exactly, what on earth?” and push for a clear answer. 究竟 sounds more formal.

你到底想去哪儿？

When to use 竟然, 究竟 and 到底 for Surprise and “What on Earth?”

All three are mood adverbs: they go after the subject and before the verb. 竟然 marks a real fact that surprises the speaker: 他竟然忘了 (he actually forgot!). 到底 and 究竟 are used in questions with a question word, a 还是 choice or a V不V form, to show you really want the true answer, often with some impatience: 你到底去不去？究竟 means the same but sounds more formal. If the subject is itself a question word, 到底/究竟 comes first: 到底谁说的？

他才学了半年，竟然能用中文写信了。

He has only studied for half a year, and he can already write letters in Chinese!

这道题的答案究竟是什么？

What exactly is the answer to this question?

我等了他一个小时，他竟然忘了。

I waited an hour for him, and he actually forgot.

你到底去不去？快告诉我。

Are you going or not? Tell me now.

Kesalahan umum

Don’t add 吗 after 到底/究竟: say 你到底去不去？, not 你到底去吗？
竟然 is for surprising facts, not for asking questions.
When the subject is 谁 or 什么, put 到底 before it: 到底谁说的？

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我等了他一个小时，他忘了

I waited an hour for him, and he actually forgot

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When to use 竟然, 究竟 and 到底 for Surprise and “What on Earth?”

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