“It”的用法很多,在英语中经常遇到。但归纳起来不外乎有以下五种:一、“It”作人称代词;二、作指示代词;三、无人称代词(或非人称代词);四、先行词(或叫先行代词);五、构成强调句型。一、在句中作人称代词: 1)一般用来指代上文提及的无生命的事物,此种用法有复数形式“they”。 It’s a lot of usage, often encountered in English. But summed up nothing more than the following five: First, “It” as a personal pronoun; Second, as a demonstrative pronoun; Third, unclaimed pronouns (or non-personal pronouns); Fourth, the antecedent (or called pronoun); five , Constitute the emphasis sentence pattern. First, in the sentence as a personal pronoun: 1) is generally used to refer to the above mentioned inanimate things, this usage has the plural form of “they”.