1
all of a sudden, + clause
常置于句首，修饰整个句子。
All of a sudden, the lights went out.
突然，灯灭了。
突然；冷不防
先理解核心含义，再看它在真实句子里的用法。
突然；冷不防
without warning; happening unexpectedly
All of a sudden, the lights went out.
突然，灯灭了。
突然地,没有预兆地
without warning
突然,意外
happening unexpectedly
All of a sudden, the lights went out.
突然，灯灭了。
She was walking calmly, when all of a sudden she started running.
她正平静地走着，突然开始跑了起来。
All of a sudden, I remembered I had an appointment.
我突然想起我有个约会。
常置于句首，修饰整个句子。
All of a sudden, the lights went out.
突然，灯灭了。
也可置于句末，强调动作的突发性。
She stopped talking all of a sudden.
她突然不说话了。
Not this
All of sudden, the lights went out.
Use this
All of a sudden, the lights went out.
固定短语中缺少冠词 'a'。'all of a sudden' 中的 'a' 不可省略，因为它是固定搭配的一部分。
Not this
All the sudden, he started laughing.
Use this
All of a sudden, he started laughing.
使用了错误的冠词 'the'。正确固定短语为 'all of a sudden'，介词 'of' 和冠词 'a' 不能替换为 'the'。
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Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
Use all of a sudden naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
固定短语，不可拆分为 all of the sudden；相当于 suddenly。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.