如何区分It be强调句型和it is when句型

Question

如题所述

Answer 1

It用于强调首先要掌握其句型结构：It is /was +被强调的部分+that/who…；当被强调的部分是人时用who，当被强调的部分是事时用that。其次要明确几个基本知识：1）不论强调的数是什么，始终用is/was；2）用is或was要根据被强调句子的时态来确定；3）当强调主语或状语时可运用 “去掉强调结构后，原句不变” 的方法进行解题分析。如：
It is these poisonous products _______can cause the symptoms of the flu, such as headache and aching muscles.(03上海)
A, who B, that C, how D, what
对主语these poisonous products进行强调，去掉It is，句子通顺，所以可以确定为强调句型，选B。
It wasn’t until nearly a month later I received the manager’s reply .（05全国I卷）
A．since B．when C．as D．that
对not…until句型进行强调用It is/was not until…that…，去掉强调结构，句子仍然通顺，所以选D。
4）对特殊问句进行强调如对疑问词进行强调，就要采用疑问词+疑问式的强调句型。如 ：
---- ______ that he managed to get the information?
---- Oh, a friend of his helped him.（05山东）
A. Where was it B. What was it C. How was it D. Why was it
原句为：______ did he manage to get the information? 根据答语，空处应为How，而对how进行强调，采用疑问词+疑问式，故选C。
5）有时考查与其它句型的区分如与It is…since../It is…when/It is…before…等句型的区分；因此，在复习备考中，要训练辨析句型的能力。如：
It is almost five years we saw each other last time.（05北京）
A. before B. since C. after D. when
这不是强调句型，是it’s + 时间段+since表不能延续的动词与段时间连用的句型，选B。
—Did Jack come back early last night?
—Yes. It was not yet eight o’clock he arrived home.（05福建）
A．before B．when C．that D．until
这是It’s +时间点 ＋when…句型，所以此题选B。
It was some time ______ we realized the truth.
A. when B.that C. since D. before
这是It is/was/will be+ 时间段+before…表 “要过…久才…”,故选D.