it的五类考点和用法一、考查 it 用作形式主语的用法当不定式、动名词、从句等用作主语时，为避免头重脚轻，通常在句首使用形式主语it，而把真正的主语放在句子末尾。如：Its no good sitting up too late. 熬夜没有好处。It doesnt matter what he says. 他说什么没关系。【特别提醒】注意it用作形式主语的三类特殊句式：1.用作动词look, seem, appear, happen, occur, follow等的主语(后接that从句或as if从句)。如：It seems that he knows everything. 他好像什么都知道。It (so) happened that I had no money with me. 碰巧我没带钱。2.当系表结构后接有if 或when引出的状语从句时，通常在系表结构前使用形式主语表示说话人对某情况的看法。如： It was a great surprise to me when he did a thing like that. 他这样做使
