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根本 vs 到底 (at all vs on earth)
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At all, or on earth?
- Your friend keeps changing his story about where he was last night.
- you你on earth到底to go去where哪儿(completed / change)了？I我at all根本not不to be convinced (that sth…相信you你at / in在library图书馆。 — "Where on earth did you go? I don't believe at all that you were in the library."
at all根本 = at all, simply (negatives) / fundamentally
- at all根本 + not不 / not / haven't没 = not at all: at all根本not不to know知道, at all根本not / haven't没to go去. It strongly rejects an idea.
- As a noun / adjective: "root, fundamental": at all根本cause原因 — "the root cause".
I我at all根本not不know认识him他。
Complete: “I don't know him at all.” 我____不认识他。
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根本 + 不 = not at all.
on earth到底 = on earth (questions) / after all
- on earth到底 + question = on earth, exactly: you你on earth到底want想what怎么样？
- In statements, on earth到底 = after all, in the end: him他on earth到底or / still还是to come来(completed / change)了.
you你on earth到底want想what怎么样？
他到底还是来了 means “In the end he came after all.”
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In statements, 到底 = after all.
Different jobs
- at all根本 strengthens a negative statement; it does not go in questions as "on earth": you你at all根本to go去where哪儿(completed / change)了 ✗.
- on earth到底 strengthens a question; it does not mean "not at all": I我on earth到底not不to know知道 ✗ → I我at all根本not不to know知道.
“What on earth do you want?” Which fits? 你____想怎么样？
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到底 strengthens questions.
Together in an argument
- question问题on earth到底at / in在where哪儿？at all根本cause原因is是a lack of缺少communication沟通。 — "Where exactly is the problem? The root cause is a lack of communication."
- on earth到底 asks; at all根本 answers at the deepest level.
the root根本cause原因is是a lack of缺少communication沟通。
Build: “The root cause is a lack of communication.”
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根本 as an adjective: root.
Recap
- at all根本 + not不/not / haven't没 = not at all; at all根本cause原因 = root cause.
- on earth到底 + question = on earth / exactly; in statements = after all.
Read the full reference: HSK 6 grammar — Comparing similar adverbs.
Your friend keeps changing his story about where he was last night. 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.