Unit 3 I'm more outgoing than my sister.知识点笔记 - 百度文库
形式主语of真正主语 (人物性格、品质形容词:kind, brave, fine, nice, stupid, clever, wise等) e.g. It is important for us to learn English. It is very nice of you to help me. … you don’t need a lot of them as long as they’re good.(朋友)不在多而贵在好。