'原来' introduces a cause just discovered or explained, while '怪不得' refers back to something that seemed strange before and now makes sense, so it's no longer surprising.
A conjunction of contrast in spoken Chinese, softer and gentler than '但是' or '可是'.
Question words in statements combined with '都' or '也' express total inclusion (everyone/everything...) or total negation (no one/nowhere/nothing...).
Conjunctions of progression. If both clauses share a subject, it comes before '不但'; if the subjects differ, each subject follows '不但' and '而且'.
Shows that the degree of a quality or feeling increases steadily over time.
Used in the second clause to state the purpose of the action in the first clause; synonymous with '是为了'.
Phrases by situation, with pinyin & audio
Learn words through real-life situations
Stroke order for every character
The building blocks of Chinese characters
Split hanzi into parts, remember by story