1.陈述句形式的主语从句用that来引导,that在从句中不充当成分,只起引导从句的作用,且不可以省略。而且为了避免头重脚轻,可以用it来代替整个主语从句,然后把真正的主语从句往后放。此时...
2. 形容词:用在advisable, appropriate, desirable, essential, fitting, imperative, important, important, possible, necessary等形容词后的从句中: It is essential that we be healthy. 我们的健康很重要。 It is advisable that these regulations be abolished...
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