1. 辨析：too much, much too, too many
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too much
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“太多”，用法相当于形容词时，常修饰不可数名词，置于名词前。
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much too
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“太”，副词短语，修饰形容词或副词原级，表示程度。
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too many
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“太多”，形容词短语，修饰可数名词复数。
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例：He is much too fat because he eats too much meat and too many sweets every day.他太胖了，因为他每天吃太多的肉和太多的糖果。
2. 辨析：while, when
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while
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当……的时候，在……期间，其谓语必须为延续性动词，常用于过去进行时态中。
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when
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“当……的时候”，其谓语可以是延续性动词，也可以是非延续性动词。
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例：While he was walking in the park, the accident happened.
当他在公园里散步时，意外发生了。
The sun was rising when we got to the top of mountain.
当我们到达山顶时，太阳正在升起。
