形式主语与形式宾语 it

外研版选择性必修第二册 Unit 4~5 重点语法。

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一、形式主语 it

用 it 代替过长的不定式短语、动名词短语或名词从句：

• It is + adj. + for sb to do sth.（修饰事物特征：easy, difficult, important）
• It is + adj. + of sb to do sth.（修饰人的品格：kind, wise, polite）
• It is + reported / believed / thought + that...

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二、形式宾语 it

公式：主语 + find / make / consider / think / feel + it + 宾补 + 真正宾语 (to do / that从句)

• The Internet makes it convenient to acquire knowledge.
• We find it necessary that everyone should know the safety rules.