高中英语选修6It的用法语法练习题及答案
It的用法在高考中也是重现率较高的语言点，尤其是it用于强调句。其考查方式多通过“单项填空”进行，偶尔也出现在“短文改错”和“完形填空”中。
1．(NMET98) It was only when I reread his poems recently ___ I began to appreciate their beauty．
A．until B．that C．then D．so
正确答案：B 此题考查强调句，所以用that。
2．(NMET98) I hate____when people talk with their mouths full．
A．it B．that C．these D．them
正确答案：A 此题考查it作形式宾语的用法，所以选A。
3．(MET91，短文改错)David and I did not agree and David pointed to a path which he thought it would probably lead to a village．
正确答案：去掉it，因为定语从句中已有宾语which。
一、要点点拔
1．代替上文中提到过的人或事物。指代人时，一般用于小孩或身份不十分明朗的人。
1) －Who is the baby?
－It‘s my teacher’s son．
2) －Who is that gentleman?
－It's my friend Tom．He(不可用It) wants to see you．
2．用于表达天气、环境、时间、距离、季节等。例如：
1) It’s half an hour’s walk from here to our school．
2) It‘s nice and warm here．
3) But it's two o'clock now, and it's time for us to go to school．
3．用作形式主语.it 没有具体意义，而只是帮助把真正的主语移至句子后尾，使句子显得平稳一些，能借it 给移至句子后尾的主语有三种：一种由不定式表示，一种由动名词表示，一种由从句表示。
1).It 替代真正的主语——动词不定式短语.
It is easier to say than to do .
It is a good act to help the others.
2).it 替代真正的主语——动名词短语,以动名词短语做主语的句子，主要在以no good, no use, no harm, dangerous, foolish 等词作表语的句中.