so和too都是程度副词，也叫强调副词，它们都可以修饰形容词和副词。区别如下：
so修饰形容词和副词，具有肯定意义，表示“程度很高”或“程度正好”。如：
I love you so much.
Gemma looked so lonely.
She was so lonely without her family.
Alexandra was so unhappy and I didn't understand why at first.
too具有否定意义，表示“程度上过于”，如：
Most of us think that the book is too easy. It doesn't suit us.
He complained that his study was too small.
The bag is too heavy for me to lift.
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