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到底 (on earth / after all)
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Are you coming or not?
- Your friend has changed his answer three times about tonight's dinner.
- you你on earth到底to come来not不to come来? — "Are you coming or not, for goodness' sake?"
on earth到底 in questions = on earth
- on earth到底 adds impatience or insistence to a question: "on earth, exactly".
- It goes before the question part: on earth到底to go去where哪儿? on earth到底is是who谁? on earth到底how怎么(completed / change)了?
you你on earth到底want想say说what什么?

Complete: “What on earth happened?” ____发生了什么?
Độ khó 1/5 · 100 xu + một phần thưởng nhỏ cho lần hoàn thành đầu tiên trong ngày
到底 + question word.
Question words and A-not-A, not (yes/no ?)吗
- this这on earth到底is是what's the matter?怎么回事? — "What on earth is going on?"
- he他on earth到底to agree同意not不to agree同意? — "Does he agree or not?" on earth到底 needs a question word or an A-not-A form.
this这on earth到底is是how怎么matter回事?
Build: “What on earth is going on?”
Độ khó 3/5 · 200 xu + một phần thưởng nhỏ cho lần hoàn thành đầu tiên trong ngày
Subject + 到底 + question.
No (yes/no ?)吗 with on earth到底
- Do not combine on earth到底 with (yes/no ?)吗: you你on earth到底去不去?, not you你on earth到底to go去(yes/no ?)吗?
- Put on earth到底 before the question part, after the subject: you你on earth到底at / in在where哪儿?
Which question is correct?
Độ khó 1/5 · 100 xu + một phần thưởng nhỏ cho lần hoàn thành đầu tiên trong ngày
到底 takes an A-not-A or a question word, never 吗.
on earth到底 in statements: after all, in the end
- he他on earth到底is是a个child孩子,别太to get angry生气。 — "He is, after all, just a child; don't be too angry."
- we / us我们to wait for等(completed / change)了degree / adjective linker很(long) time久,he他on earth到底or / still还是to come来(completed / change)了。 — "We waited a long time, and in the end he did come."
he他after all到底is是a个child孩子。
In 他到底是个孩子, 到底 means “after all”.
Độ khó 1/5 · 100 xu + một phần thưởng nhỏ cho lần hoàn thành đầu tiên trong ngày
In statements, 到底是 = after all.
Recap
- on earth到底 + question (QW or A-not-A) = on earth / exactly; never with (yes/no ?)吗.
- In statements: on earth到底is是… = after all; on earth到底or / still还是 = in the end.
Read the full reference: HSK 4 grammar — Adverbs.
Your friend has changed his answer three times about tonight's dinner. Close the examples. Say a Mandarin response, then write it in Chinese. Explain briefly in English what the lesson’s pattern adds. Compare with the model, then change one detail and try again.
This is supported productive practice. Compare meaning and structure; your answer need not copy the model. A partner or teacher must hear the spoken response to comment on pronunciation.