It seems(appears)+形容词+to do It seemed impossible to save money.
常用表示客观情况的形容词,如:difficult,easy,hard,important,impossible,necessary 等
常用careless,clever,good,foolish,honest,kind,lazy,nice,right,silly,stupid
在不定式前的sb,可看作其逻辑主语。这一句式有时相当于Sb is+形容词+to do句式
It's kind of you to help me with my English.=You are kind to helpme with my English.