Unit 8重点例句及相关知识的讲解
　　1. To be here at Christmas time is a dream，that has come true!
　　圣诞期间到这儿来是（我的）梦想，它终于实现了。
　　句中的to be here作主语，是动词不定式作主语。that引导的从句在句中作dream的定语。
　　【例】To help her is necessary. = It’s necessary to help her.
　　帮助她是必要的。
　　动词不定式在句中可以作主语，有时可以用it来作形式主语。To be here at Christmas time is a dream. = It’s a dream to be here at Christmas time.
　　2. Let’s help decorate th